Question

4 Four bells toll ar intervals of 6. 12 and 18 mins respectively. They started to tolling together, how many
times will they toll together in 6 hours!
(PSC Misc)
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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 6 hours they commenced = 6/2

Total times they commenced = 2 + 1 (initial)

= 3 times