MCQ
Six bells commence tolling together and toll at intervals of 2, 4, 6, 8, 10 and 12s respectively. In 30 min, how many times do they toll together?
Options
4
10
15
16
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Solution
16
Explanation:
LCM, of 2, 4, 6, 8, 10, 12, is 120.
So, the bells will toll together after every 120 s (2 min).
In 30 min, they will toll together `30/2` + 1 = 16 times
Concept: Number System (Entrance Exam)
Is there an error in this question or solution?
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