Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

**Devantè****Real Member**- Registered: 2006-07-14
- Posts: 6,400

Offline

**Devantè****Real Member**- Registered: 2006-07-14
- Posts: 6,400

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 24,651

Answers to #1380, #1427, #1431, and #1627:-

All correct, Devantè!

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 24,651

#1711. What is the value of

#1712. What is the value of

#1713. What is the value of 1 + 11 + 21 + 31 +41 + ...... + 1001?

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 24,651

#1714. A is thrice as good a workman as B and takes 20 days less to do a piece of work than B. In how many days can B do the work?

#1715. A train 700 meters long is running at the speed of 72 kilometers per hour. If it crosses a tunnel in 1 minutes, then what is the length of the tunnel in meters?

#1716. A man can row three quarter of a kilometer against the stream in 11 and a quarter minutes. If the speed of the stream is 1 kilometer per hour, what is the speed of the man rowing in still water?

#1717. If three workers working 8 hours a day finish a work in 5 days, then in how many days can one worker, working 10 hours a day finish the same work?

#1718. If $516 is divided among A, B, and C such that A receives 25% more than B and B receives 25% less than C, then what is the amount C receives?

#1719. R travels at the rate of 3 km/hour and reaches his destination 15 minutes late. If he travels at the rate of 4 kn/hour, he reaches15 minutes earlier. What is the distance R has to travel?

#1720. The simple interest on a sum of money at 5% per annum interest is $48 for 4 years. What would be the simple interest for the same sum for 5 years at the rate of 4% per annum?

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**Devantè****Real Member**- Registered: 2006-07-14
- Posts: 6,400

Offline

**JaneFairfax****Member**- Registered: 2007-02-23
- Posts: 6,868

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 24,651

Answer to #1713:-

Correct, JaneFairfax!

I guess, it was a minor calculation mistake, Devantè.

Approximately, a number close to 50 multiplied by a number close to 1000 should produce a number close to 50,000. But in 10 seconds, nobody may think of all these things!

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 24,651

#1721. If a car travels the first 40 kilometers at a speed of 20 km/hour, the next 50 kilometers at a speed of 25 km/hour and the final 90 kilometers at a speed of 15 km/hour, what is the average speed of the car for the entire distance?

#1722. Which is the smallest odd prime number 12345674 is divisible by?

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**JohnnyReinB****Member**- Registered: 2007-10-08
- Posts: 453

*"There is not a difference between an in-law and an outlaw, except maybe that an outlaw is wanted" *

Nisi Quam Primum, Nequequam

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 24,651

Answer to #1721:-

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 24,651

#1723. In a Geometric Progression with first term a and common ratio r, what is the Arithmetic Mean of the first five terms?

#1724. What is the sum of the integers from 1 to 100 that are divisible by 2 or 5?

#1725. What is the value of

(1)[sub]2[/sub] + (11)[sub]2[/sub] + (111)[sub]2[/sub] + (1111)[sub]2[/sub] + (11111)[sub]2[/sub]?

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 24,651

#1726.Eighteen football teams take part in a tournament and every team meets every other team twice. How many matches are played in the tournament?

#1727. Out of 40 children, 30 can swim, 27 can play chess and only 5 can do neither. How many children can swim only?

#1728. What is the value of

#1729. If m and n are the roots of the equation 4x[sup]2[/sup] - 4x - 1 = 0, then what is the value of m[sup]3[/sup] + n[sup]3[/sup]?

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 24,651

#1730. What is the number of 2 digit even numbers that can be formed from the digits 1, 2, 3, 4, and 5, repetition not being allowed?

#1731. The first and eighth terms of a Geometric Progression are x[sup]-4[/sup] and x[sup]52[/sup] respectively. What is the second term?

#1732. What is the value of

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 24,651

#1733. What is the value of

#1734. What is the value of

#1735. What is the value of

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 24,651

#1736. Find the 10[sup]th[/sup] term of an Arithmetic Progression whose first term is 12 and the common difference is 5.

#1737. Find the sum

#1738. If A = {a, b, c, d, e}, B = {b, d, f, g}, and C = {b, e, f, h}, find

#1739. If the straight line 7x - 5y = k passes through the point (1,1), find the value of k.

#1740. In a Geometric Progression, the fourth term is 27 and the seventh term is 729. Find the fourth term.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 24,651

#1741. Find the value of 104 x 96.

#1742. If x = 2 + √3, find the value of

#1743. In a right angled triangle,

Find the value of tan A x cosec A.

#1744. Find the point of intersection of the straight line 2x-3y = 6 with the y-axis.

#1745. Three solid spheres of radii 3 cm, 4cm, and 5 cm are melted and a bigger spher is formed. Find the radius of the bigger sphere.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 24,651

#1746. Solve for x and y:

.

#1747. Find the value of k for which the following system of equations has infinite solutions:

kx + 3y = 3

12x + ky = 6.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 24,651

#1748. What is th sum of the Geometric Progression

1, 3, 9, 27, .... to 9 terms?

#1749. What is the remainder when x[sup]3[/sup] + x[sup]2[/sup] + 5 is divided by (x-1)?

#1750. What is the square root of 36a[sup]16[/sup]?

#1751. What is the equation of the straight line passing through

(2, -3) an parallel to the x-axis?

#1752. What is the square root of 9x[sup]2[/sup]+30x+25?

#1753. In a cyclic quadrilateral ABCD, the measure of angle A is 5x degrees and measure of angle C is 3x degrees. What is the value of x in degrees?

#1754. The center of a circle is (-6,4). A diameter of the circle has its one end at the origin. What are the coordinates of the other end?

#1755. Find the Least Common Multiple of

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 24,651

#1756. The sum of a number and its reciprocal is

Find the number.

#1757. Which term of the Arithmetic Progression 21, 42, 63, .... is 420?

#1758. A cone has radius 7 cm and slant height 25 cm. Find the curved surface area of the cone.

#1759. Find m if 5x[sup]5[/sup] - 9x[sup]3[/sup] + 3x + m leaves a remainder 7 when divided by

(x + 1).

#1760. Solve:- x[sup]2[/sup] - x - 12 = 0.

*Last edited by ganesh (2009-03-20 05:07:05)*

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**JohnnyReinB****Member**- Registered: 2007-10-08
- Posts: 453

Is it just me or are most of the questions getting just a little bit easier?

*"There is not a difference between an in-law and an outlaw, except maybe that an outlaw is wanted" *

Nisi Quam Primum, Nequequam

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 24,651

Answers to #1723, #1727, #1736, #1738, #1739, #1740, #1742, #1744, #1745, #1747, #1750, #1751, #1752, #1754, #1755, #1756, and #1757:-

All the answers are correct, JohnnyReinB, other than #1723, #1739, and #1755.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**JohnnyReinB****Member**- Registered: 2007-10-08
- Posts: 453

ay, LCM, haha

curious, what's the answer to 1739?

*"There is not a difference between an in-law and an outlaw, except maybe that an outlaw is wanted" *

Nisi Quam Primum, Nequequam

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 24,651

Answer to #1755:

Correct, JohnnyReinB!

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**JohnnyReinB****Member**- Registered: 2007-10-08
- Posts: 453

ahh, yes.

Oh my, I keep on forgetting 7-5=2

For some weird reason, my brain insists it's 3, as my answer suggests, haha.

*"There is not a difference between an in-law and an outlaw, except maybe that an outlaw is wanted" *

Nisi Quam Primum, Nequequam

Offline