Question

Six bells comments 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?​

Answer 1

Answer:

In this type of question

First take out LCM OF 2, 4, 6, 8, 10, 12

1, 2, 3, 4, 5, 6 .................. 2

1, 1, 3, 2, 5, 3 ................... 2

1, 1, 1, 2, 5, 1 .................... 3

1, 1, 1, 1, 5, 1 .................... 2

1, 1, 1, 1, 1, 1 ..................... 5

LCM (2 x 2 x 2 x 3 x5) = 120

That means in 120 min = 2 hours

In 30 hours they commenced =30 / 2 = 15

Total times they commenced = 15 + 1 (initial)

= 16 times

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