Question

7. Three bells ring at intervals of 7, 10 and 14 minutes respectively.
They begin by ringing together. After how long will they ring
together again?

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Answer 1

Three bells 7,10,14 minutes

They will be ringing after L.C.M of (7,10,14) minutes

Factorise 7,10,14

7=7

10=5×2

14=7×2

⇒ L.C.M (7,10,14)=7×2×5=70

∴ They will be ringing together after 70 minutes.

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Answer 2

Answer:

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