Question

40 men can do a piece of work in a given times If only 30 men be changed, 6 more days needed t complete the work. In how many days can 60 men do the work ?

• A. 9
• B. 10
• C. 12
• D. 15

Answer 1

Answer: (C)

12

Suppose 40 men can do a piece of work in x days Then 30 men can do the same work in $\frac{x\times 40}{30}$ days = (x + 6) days
$\Rightarrow$ 4x = 3x + 18 $\Rightarrow$ x = 18 $\therefore$ 60 men can do the same work in $\frac{18\times 40}{60}$ days = 12 days