question_answer

Working 7 h in a day, 4 men can do a piece of work in 8 days. Working 8 h in a day, the required number of men to perform the same work in 4 days will be [SSC CGL Tier II, 2017]

A) 8

B) 4

C) 7

D) 9

Correct Answer: C

Solution :

[c]     \[\therefore \]     \[\left. \begin{matrix}    7:8  \\    8:4  \\ \end{matrix} \right\}::x:4\]\[\Rightarrow \]\[7\times 8\times 4=8\times 4\times x\] \[\Rightarrow \]   \[x=\frac{7\times 8\times 4}{8\times 4}=\]\[\Rightarrow \]\[x=7\]