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### Question

Mr. X can finish a task in 13 days. Mr. Y can do the same work in 8 days. What is the ratio of the efficiencies of X : Y?

**A**

${8/13}$.

**B**

$1{8/13}$.

**C**

${2/3}$.

**D**

${9/14}$.

**Soln.**

**Ans: a**

The efficiency of X is $100/13$%, and the efficiency of Y is $100/8$%, so the ratio will be $8/13$