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  1. X is 4 times more efficient as Y , then the number of days taken by X and Y are in the ratio ?
    1. 8 : 1
    2. 1 : 5
    3. 6 : 8
    4. 5 : 1
Correct Option: B

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


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