Discussion of Question with ID = 053 under HCF-and-LCM

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Question

Which is the largest number that divides 30 by leaving a remainder 7, and also divides 31 by leaving a remainder 8?

A

23.

B

24.

C

22.

D

25.

Soln.
Ans: a

The required number is the HCF of 30 - 7 = 23 and 31 - 8 = 23. HCF of 23 and 23 is 23.


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