LCM & HCF

Six bells commence tolling together and toll at intervals of 2, 4, 6, 8, 10 and 12 seconds respectively. In 30 minutes, how many times do they toll together?
A.8
B.11
C.13
D.16

Answer

The least multiple of 7, which leaves a remainder of 4, when divided by 6, 9, 15 and 18 is:

A.68
B.98
C.180
D.364

Answer

The least number, which when divided by 48, 60, 72, 108 and 140 leaves 38, 50, 62, 98 and 130 as remainders respectively, is:

A.11115
B.15110
C.15130
D.15310

Answer

The H.C.F. of two numbers is 11 and their L.C.M. is 7700. If one of the numbers is 275, then the other is:

A.269
B.275
C.308
D.310

Answer

A, B and C start at the same time in the same direction to run around a circular stadium. A completes a round in 252 seconds, B in 308 seconds and C in 198 seconds, all starting at the same point. After what time will they meet again at the starting point?

A.15 minutes 15 seconds
B.42 minutes 30 seconds
C.42 minutes
D.46 minutes 12 seconds

Answer

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