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

You are not logged in.

#5576 2017-10-14 14:47:44

ganesh
Registered: 2005-06-28
Posts: 26,149

Re: Oral puzzles

Hi,

#3817. A card is drawn at random from a pack of 52 cards. Find the probability that the card drawn is jack, queen, or king.

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

#5577 2017-10-15 16:17:29

Monox D. I-Fly
Member
From: Indonesia
Registered: 2015-12-02
Posts: 1,269

Re: Oral puzzles

Last edited by Monox D. I-Fly (2017-10-15 16:18:23)

Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away. May his adventurous soul rest in peace at heaven.

Offline

#5578 2017-10-15 21:32:25

ganesh
Registered: 2005-06-28
Posts: 26,149

Re: Oral puzzles

Hi,

The solution #3817 is correct. Neat work, Monox D. I-Fly!

#3818. A card is drawn at random from a pack of 52 cards. Find the probability that the card drawn is neither a red card nor a queen.

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

#5579 2017-10-16 01:05:31

Monox D. I-Fly
Member
From: Indonesia
Registered: 2015-12-02
Posts: 1,269

Re: Oral puzzles

Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away. May his adventurous soul rest in peace at heaven.

Offline

#5580 2017-10-16 03:00:42

ganesh
Registered: 2005-06-28
Posts: 26,149

Re: Oral puzzles

Hi,

Good attempt, Monox D. I-Fly!

#3819. A 16 meter deep well with diameter 3.5 meter is dug up and the earth from it is spread evenly to form a platform 27.5 meter by 7 meter. Find the height of the platform,

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

#5581 2017-10-18 14:11:12

ganesh
Registered: 2005-06-28
Posts: 26,149

Re: Oral puzzles

Hi,

#3820. Solve:
3x + y + 1 = 0,
2x - 3y + 8 = 0.

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

#5582 2017-10-21 01:20:11

ganesh
Registered: 2005-06-28
Posts: 26,149

Re: Oral puzzles

Hi,

#3821. Solve:
2x + y - 3 = 0,
2x - 3y - 7 = 0.

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

#5583 2017-10-21 12:54:13

Monox D. I-Fly
Member
From: Indonesia
Registered: 2015-12-02
Posts: 1,269

Re: Oral puzzles

Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away. May his adventurous soul rest in peace at heaven.

Offline

#5584 2017-10-21 14:17:56

ganesh
Registered: 2005-06-28
Posts: 26,149

Re: Oral puzzles

Hi,

The solution set in #3821 is correct. Good work, Monox D. I-Fly!

#3822. Solve:
x + y = 4,
2x - 3y = 3.

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

#5585 2017-10-22 01:17:12

Monox D. I-Fly
Member
From: Indonesia
Registered: 2015-12-02
Posts: 1,269

Re: Oral puzzles

Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away. May his adventurous soul rest in peace at heaven.

Offline

#5586 2017-10-22 03:45:10

ganesh
Registered: 2005-06-28
Posts: 26,149

Re: Oral puzzles

Hi,

The solution #3822 is correct. Neat work, Monox D. I-Fly!

#3823. Solve:
2x + 3y = 4,
x - y + 3 = 0.

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

#5587 2017-10-22 11:25:36

Monox D. I-Fly
Member
From: Indonesia
Registered: 2015-12-02
Posts: 1,269

Re: Oral puzzles

Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away. May his adventurous soul rest in peace at heaven.

Offline

#5588 2017-10-22 12:17:23

ganesh
Registered: 2005-06-28
Posts: 26,149

Re: Oral puzzles

Hi,

The solution set in #3823 is correct. Good work, Monox D. I-Fly!

#3824. Solve:
2x - 3y + 13 = 0,
3x - 2y + 12 = 0.

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

#5589 2017-10-28 13:44:15

ganesh
Registered: 2005-06-28
Posts: 26,149

Re: Oral puzzles

Hi,

#3825. Solve:
2x + 3y + 5 = 0,
3x - 2y - 12 = 0.

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

#5590 2017-10-31 14:24:19

ganesh
Registered: 2005-06-28
Posts: 26,149

Re: Oral puzzles

Hi,

#3826. Solve:
3x - 7y + 10 = 0,
y - 2x - 3 = 0.

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

#5591 2017-11-02 00:31:33

ganesh
Registered: 2005-06-28
Posts: 26,149

Re: Oral puzzles

Hi,

#3827. Solve:
x + 2y + z = 7,
x + 3z = 11,
2x - 3y = 1.

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

#5592 2017-11-04 00:43:28

ganesh
Registered: 2005-06-28
Posts: 26,149

Re: Oral puzzles

Hi,

#3828. Solve:

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

#5593 2017-11-07 02:37:25

ganesh
Registered: 2005-06-28
Posts: 26,149

Re: Oral puzzles

Hi,

#3829. Solve:
11x + 15y + 23 = 0,
7x - 2y - 20 = 0.

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

#5594 2017-11-09 02:14:32

ganesh
Registered: 2005-06-28
Posts: 26,149

Re: Oral puzzles

Hi,

#3830. Solve:

,

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

#5595 2017-11-11 00:29:16

ganesh
Registered: 2005-06-28
Posts: 26,149

Re: Oral puzzles

Hi,

#3831. Find the mean of first 'n' odd natural number.

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

#5596 2017-11-15 08:27:13

ganesh
Registered: 2005-06-28
Posts: 26,149

Re: Oral puzzles

Hi,

#3832. If the mean of first n odd numbers is

, find the value of n.

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

#5597 2017-11-17 14:57:25

ganesh
Registered: 2005-06-28
Posts: 26,149

Re: Oral puzzles

Hi,

#3833. If the Arithmetic Mean of x, x + 3, x + 6, x + 9, and x + 12 is 10, what is the value of x?

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

#5598 2017-11-17 18:32:30

Monox D. I-Fly
Member
From: Indonesia
Registered: 2015-12-02
Posts: 1,269

Re: Oral puzzles

Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away. May his adventurous soul rest in peace at heaven.

Offline

#5599 2017-11-17 18:56:09

ganesh
Registered: 2005-06-28
Posts: 26,149

Re: Oral puzzles

Hi,

The solution #3833 is correct. Neat work, Monox D. I-Fly!

#3834. If the median of the data : 24, 25, 26, x + 2, x + 3, 30, 31, 34 is 27.5, then find the value of x.

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

#5600 2017-11-17 19:53:01

Monox D. I-Fly
Member
From: Indonesia
Registered: 2015-12-02
Posts: 1,269

Re: Oral puzzles

Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away. May his adventurous soul rest in peace at heaven.

Offline