Question

Mark (✓) against the correct answer
10 men can finish the construction of a wall in 8 days. How meny men are added to finish the work in half a day?

(a) 160
(b) 100
(c) 120
(d) 150

Answer 1

Men required to finish the work in 8 days = 10
Men required to finish the work in 1 day = 10$\times$8 [More day, less men]
Men required to finish the work in half a day = $\frac{10\times 8}{{\displaystyle \frac{1}{2}}}=10\times 8\times 2$= 160 [Less days, more men]
Hence, 150 (i.e., 160 − 10) men are added to finish the work in half a day.

The correct option is (d).