H.C.F and L.C.M Problems-Data Intensity 1 Questions and Answers Discussion Page.

3.	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

Answer: Option D

Explanation:

L.C.M. of 2, 4, 6, 8, 10, 12 is 120.

So, the bells will toll together after every 120 seconds(2 minutes).

In 30 minutes, they will toll together	30	+ 1 = 16 times.
	2

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Published by:Michael Daani

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