Question

4. Four bells ring at intervals of 8, 12, 18 and 20 minutes respectively. At what
time will they ring simultaneously if they start ringing together at 12noon?​

Answer 1

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Four bells ring at intervals of 8, 12, 18 and 20 minutes respectively.

To find :-The time will they ring simultaneously if they start ringing together at 12 noon?​

Find LCM of 8, 12, 18, 20

8= 2×2×2

12= 2×2×3

18= 2×3×3

20 = 2×2×5

L.C.M = 360.

After 360 minutes bells will ring together.

We know that,  

60 minutes = 1 hour

∴ 360/60 = 6 hours  

12 noon + 6 hours = 6pm.

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Answer 2

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