Home > Aptitude> Problems on H.C.F and L.C.M

1 . 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. Aft
A. 26 minutes and 18 seconds
B. 42 minutes and 36 seconds
C. 45 minutes
D. 46 minutes and 12 seconds

2 . Find the lowest common multiple of 24, 36 and 40.
A. 120 B. 240
C. 360 D. 480

3 . The H.C.F. of two numbers is 23 and the other two factors of their L.C.M. are 13 and 14. The larger of the two numbers is:
A.  276 B. 299
C. 322 D. 345

4 . 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. 4 B. 10
C. 15 D. 16

5 . The product of two numbers is 2028 and their H.C.F. is 13. The number of such pairs is:
A.  1 B. 2
C. 3 D. 4




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