Discussion of Question with ID = 052 under HCF-and-LCM

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Question

Which is the least number which must be added to 21937 so that it becomes divisible by 21, 95 and 77?

A

8.

B

9.

C

7.

D

10.

Soln.
Ans: a

The LCM of 21, 95 and 77 = 21945. The lcm when divided by either of these numbers leaves the remainder 0. The minimum number to be added is 21945 - 21937 = 8.


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