Last edited by JaneFairfax (2009-02-20 08:39:25)

Answers to #313, #315, and #318:
I cannot believe this! None of the answers are correct, JaneFairfax and careless25!
Of the wrong answers, #318 is the only one which is the result of a minor mistake. The other answers are nowhere near the correct ones!
Please try again!!!

#321. A, B, and C together earn $7600 and spend 70%, 75%, and 80% of their salaries respectively. If their savings are in the ratio 4:5:6 respectively, what is the salary of B?

#322. A and B are two fixed points 5 centimeters apart. C is a point on AB such that AC = 3 centimeters. If the lenght of AC is increased by 6%, by what percentage is the length of BC decreased?

#323. 1 liter of water is added to 5 liters of alcohol water solution containing 40% alcohol. What is the strength of alcohol in the new solution?

Answers to #322, and #323:-
Both correct, JaneFairfax!


#324. An equilateral triangle and a square are inscribed in a circle. What is the ratio of the area of the square to that of the equilateral triangle?

#325. Of all the 5 digit numbers that can be formed using the digits in the number system with Base 7, allowing repetition of digits, how many numbers would be even?

Answer to #320:


#326. A bag contains Rs.50, Rs.20, and Rs.5 notes such that the number of Rs.50 notes is half the number of Rs.20 notes, and the number of Rs.5 notes is thrice the number of Rs.50 notes. If the total value of the notes in the bag is Rs.2,520, what is the number of Rs.50 notes?

#327. The weight of a single grape is 4 grams. Fresh grapes contain 81% water and dry grapes contain 24% water. What is the weight of dry grapes that can be obtained from 12,500 fresh grapes?

#330. If the numbers given below are in binary system, what is the value of

?

#331. There are fourchairs with two chairs in each row. In how many ways can four persons be seated on the chairs, so that no chair remains unoccupied?

#332. In how many ways can the letters of the word CORPORATION be arranged so that the vowels always occupy even places?

#333. If all the permutations of the letters of the word 'LAGAN' are arranged as in a dictionary, then what is the rank of 'NAAGL'?

#334. Given

and

,
then what is

equal to?

#335. Under what condition is the tangent to a given curve at a point perpendicular to the x-axis?

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

#337. What is the following product equal to?

?

#338. What is the value of x if

?

#340. What is the last digit before the three zeros in 19! ?

#341. Find the sum of all odd three digit numbers that are divisible by 5.

My Attempts...

#343. A uniform circular coin required too much metal relative to its value. Hence, it was decided to reduce the diameter of the coin by 10% and the thickness by 15%. Approximately, by how much percentage would the weight of the coin reduce if everything else about the coin remains unchanged?

#344. A and B solve a quardratic equation. A makes a mistake in the constant term and gets the roots as 5 and -3. B makes a mitake in the coefficient of x and gets the roots as 1 and -3. What are the correct roots of the quadratic equation?

#345. A worker was engaged for a job for 30 days on the condition that he would get a wage of $10 for everyday he works, but would have to pay a fine of $2 for his first day of absence. The fine would be doubled for the second day of absence and would be doubled for every additional day of absence., (Thus, he wouldhave to pay a fine of $2 for a day's absence, $4 for two days absence, $8 for three days absence, and so on). If he gets $114 at the end of 30 days, for how many days was he absent?

#346. How many 3 digit numbers are there which are divisible by 5 but not divisible by 25 and in which there are no repetition of digits?

Answer to #346:-
Correct, JaneFairfax!

#348. Two regular polygons have number of sides in the ratio 4:5 and the measure of interior angles in the ratio 25:26 respectively. How many sides does the regular polygon with lesser number of sides have?