Four bells begin to toll together and then each one at intervals of 6s, 7s, 8s and 9s respectively. The number of times they will toll together in the next 1 hour is

7 times

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8 times

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6 times

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never

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Solution

The correct option is D 7 times
LCM of 6,7,8,9 is 504
So the bell is ring together after an interval of 504 Seconds
$∴$ number of times the bell will ring in 1 hour=3600 Seconds
$\frac{3600}{504} = 7 t i m e s$
$∴$ the bell will ring In 7 times in 1 hour

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Four bells begin to toll together and then each one at intervals of 6s, 7s, 8s and 9s respectively. The number of times they will toll together in the next 1 hour is

The correct option is D 7 timesLCM of 6,7,8,9 is 504So the bell is ring together after an interval of 504 Seconds∴number of times the bell will ring in 1 hour=3600 Seconds3600504=7times∴ the bell will ring In 7 times in 1 hour

The correct option is D 7 times
LCM of 6,7,8,9 is 504
So the bell is ring together after an interval of 504 Seconds
$∴$ number of times the bell will ring in 1 hour=3600 Seconds
$\frac{3600}{504} = 7 t i m e s$
$∴$ the bell will ring In 7 times in 1 hour