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### Question

Mr. X can finish a task in 7 days. Mr. Y can do the same work in 4 days. What is the ratio of the efficiencies of X : Y?

**A**

${4/7}$.

**B**

$1{4/7}$.

**C**

${2/3}$.

**D**

${5/8}$.

**Soln.**

**Ans: a**

The efficiency of X is $100/7$%, and the efficiency of Y is $100/4$%, so the ratio will be $4/7$