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Aptitude - Problems on H.C.F and L.C.M

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Exercise

• General Questions
"Two things are infinite: the universe and human stupidity; and I'm not sure about the universe."
- Albert Einstein
11.

Find the lowest common multiple of 24, 36 and 40.

 A. 120 B. 240 C. 360 D. 480

12.

The least number which should be added to 2497 so that the sum is exactly divisible by 5, 6, 4 and 3 is:

 A. 3 B. 13 C. 23 D. 33

13.

 Reduce 128352 to its lowest terms. 238368

A.
 3 4
B.
 5 13
C.
 7 13
D.
 9 13

14.

The least number which when divided by 5, 6 , 7 and 8 leaves a remainder 3, but when divided by 9 leaves no remainder, is:

 A. 1677 B. 1683 C. 2523 D. 3363

15.

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 again at the starting point ?

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