Time and Work Practice Test 4 with solutions

Work done by 90 men in 40 days = $\frac{1}{3}$
Work done by 90 men in 1 day = $\frac{1}{120}$
Work done by 90 men in 60 days = $\frac{60}{120}$ = $\frac{1}{2}$
Number of man required to finish $\frac{1}{2}$ work in 60 days = 90 men
Number of man required to finish 1 work in 60 days = 90 × 2 = 180 men
Number of man required to finish $\frac{2}{3}$ work in 60 days = 180 × $\frac{2}{3}$ = 120 men
Number of more men to be employed is 30.