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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)

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