# 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? - Mathematics

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?

• 4

• 10

• 15

• 16

#### 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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