MATHEMATICAL PUZZLES

1. Which number in the following series occurs a second time nearest the beginning?

9 7 8 6 7 5 6 4 5 3 4 2 3 1 2 0

2. The sum and product of two numbers are 8 & 15 respectively .The sum of their reciprocal is?
3. If 6 men working 8 hours a day earn Rs 720 per week ,then 8 men working 6 hours a day will earn per week?

4. if A:B =3:4 and B:C =5:6 THEN A:B:C=?

5. A and B can do a work in 12 and 15 days respectively .They starts the work together but A left after 4 days due to illness .The remaining work was finished by B in ?

6. The average of 12 numbers in 20 .If each number is multiplied by 3 ,the average of the new numbers will be?

7. If it was a Saturday on 17^th December ,1982 ; What will be the day on 22^nd September ,1984?

8. If the difference between three times and seven times of a number comes to 36 ,what is that number?

9. All the numbers in the following set have been obtained by multiplication of two prime numbers ;6,35,143,323 .What is the difference in the value of the lowest and the highest prime numbers used?

10. Father is 5 years older than mother and the mother’s age is thrice the age of the daughter .The daughter is now 10 years old .What was the father’s age when the daughter was born?

ANSWERS

1. 7

2. 8/15

3. RS 720

4. 15:20:24

5. 6 DAYS

6. 60

7. SUNDAY

8. 9

9. 17

10. 25 YEARS