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

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Find the greatest 4-digit number exactly divisible by 3, 4 and 5?

A. 9985 B. 9960 C. 9957 D. 9975...

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. 279 B. 283 C. 308 D. 318...

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. 26 min 18 sec B. 42 min 36 sec C. 45 min D. 46 min 12 sec...

Four bells begin to toll together respectively at the intervals of 8, 10, 12 and 16 seconds. After how many seconds will they toll together again?

A. 246 seconds B. 242 seconds C. 240 seconds D. 243 seconds...

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...