12 revolutions takes 1/8 th second time.In 20 seconds how many revolutions?

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1. 1920

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2. Since for 12 revs. it takes 1/8th sec;
   it will take 96 (i.e 8*12) rev for 1 sec;
   this implies 96*20 revs in 20 sec
   wich is equal to 1920.

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