## The wheels revolve round a common horizontal axis. They make 15, 20 and 48 revolutions in a minute respectively. Starting with a certain point on the circumference down wards. After what interval of time will they come together in the same position?

A. 1 min
B. 2 min
C. 3 min
D. None

Explanation:

Time for one revolution = 60/15 = 4

60/ 20 = 3

60/48 = 5/4

LCM of 4, 3, 5/4

LCM of Numerators/HCF of Denominators =

60/1 = 60…

A. 78
B. 68
C. 58
D. None…

A. 420
B. 515
C. 435
D. 518…

## Find the greatest number of four digits which when divided by 10, 15, 21 and 28 leaves 4, 9, 15 and 22 as remainders respectively?

A. 9654
B. 9666
C. 9664
D. 9864…

## A heap of stones can be made up into groups of 21. When made up into groups of 16, 20, 25 and 45 there are 3 stones left in each case. How many stones at least can there be in the heap?

A. 7203
B. 2403
C. 3603
D. 4803…

## Find the least number which when divide by 2, 3, 4, 5 and 6 leaves 1, 2, 3, 4 and 5 as remainders respectively, but when divided by 7 leaves no remainder?

A. 210
B. 119
C. 126
D. 154…

## Find the least number which when divided by 6, 7, 8, 9 and 10 leaves 1, 2, 3, 4 and 5 as remainders respectively, but when divided by 19 leaves no remainder?

A. 5073
B. 5016
C. 5054
D. 5035

## Find the least multiple of 13 which when divided by 6, 8 and 12 leaves 5, 7 and 11 as remainders respectively? A. 143 B. 169 C. 260 D. 221

A. 143
B. 169
C. 260
D. 221…

## Three men start together to travel the same way around a circular track of 11 kilometers in circumference. Their speeds are 4, 5 and 8 kilometers per hour respectively. When will they meet at a starting point?

A. 11 hours
B. 12 hours
C. 220 hours
D. 22 hours…

## Find the least square number which is divisible by 10, 12, 15 and 18?

A. 1600
B. 900
C. 3600
D. 2500…