Time and Work Practice Test 3 with solutions

10 men = 18 boys
25 men = $\frac{18}{10}\times 25$ = 45 boys
Hence, 25 men + 15 boys = 45 + 15 = 60 boys
Now, 18 boys can do a piece of work in 15 days.
Hence, 60 boys will do a piece of work in $\frac{15\times 18}{60}$ = $\frac{9}{2}$ days
= $4\frac{1}{2}$ days