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FACTORS AND MULTIPLES
Exercise :
1. Four bells toll with intervals of 30, 70, 120 and 140 seconds respectively. After how long
will they again toll together.
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Answer:
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Answered by
1
Answer:
L. C. M. of 6,7,8,9=504
∴ The bells will start ringing after an interval of every 504 seconds.
Now 2 hours =2×60×60 seconds =7200 seconds
∴ Number of times the bell will ring in 2 hours =
504
7200
=14.2 times
Since the bells rang together at the start also therefore the bells will ring 15 times in 2 hours.
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