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Three bells ring at intervals of (20), (28), and (35) seconds. They ring together now. After how many seconds will they ring together again?

Answer and explanation

Correct answer: (140)

Step 1: The time after which all ring together is the LCM of the intervals. Step 2: (20=2^2\times5), (28=2^2\times7), and (35=5\times7), so LCM (=2^2\times5\times7=140). Step 3: For repeated time events, use LCM.

Related tags

Real-NumbersLcmTime-IntervalHcf And Lcm Using Prime FactorisationHcf Lcm Using Prime FactorisationReal NumbersMathematicsClass 10 Mcq

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