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If the ratio of speed of doing work of the persons is 1 : 3 : 5 , what is the ratio of this taken by these people to do the same amount of work ?

A. 15 : 5 : 3

B. 15 : 5 : 7

C. 3 : 15 : 5

D. 15 : 3 : 5

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সঠিক উত্তরঃ A. 15 : 5 : 3

Explanation:

a/2=b/2=c/2 হলে নিচের কোনটি সঠিক?
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If the ratio of speed of doing work of the persons is 1 : 3 : 5 , what is the ratio of this taken by these people to do the same amount of work ?