• # question_answer A certain work can be done in a certain time by 25 men, with 5 men less, it could have been done in 3 days more. In what time can it be done by 40 men? A)  $5\frac{1}{2}$ days B)  $7\frac{1}{2}$ days C)  $9\frac{1}{2}$ days D)  $12\frac{1}{2}$ days

By MDH formula, $25\times d=20\times \,(d+3)$ $\Rightarrow$ $d=12$ days $\therefore$ $25\times 12=40\times d$ $\Rightarrow$ $d=7\frac{1}{2}$ days