Question

A girl was trying to study but there was lots of noise around her. Her clock ticked after every 21 seconds, a car passed from street after every 48 secs and her brother made noise after every 28 secs. After how many secs all three things will happen altogether.

Answer 1

Answer:

Tickle of clock = 21 sec

car noise = 48 sec

noise bcoz of brother = 28 sec

So calculating LCM

21 = 3×7

28 = 2×2×7

48 = 2×2×2×2×3

LCM = 2×2×2×2×3×7 = 336

So after 336 seconds.

Step-by-step explanation:

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