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X is 4 times more efficient as Y , then the number of days taken by X and Y are in the ratio?

8 : 1
1 : 5
6 : 8
5 : 1

Correct Answer: 1 : 5

Explanation:

Efficiency (X : Y) = 5 : 1
No. of days (X : Y) = 1 : 5

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