20 men can finish a piece of work in 30 days. After 15 days it is found that only 25% of the work finished. How many extra men are required to finish the work on stipulated time?

40

\(\frac{M_1 × D_1}{M_2 × D_2}\) = \(\frac{Work_1}{Work_2}\)

ATQ,

\(\frac{20\;×\;15}{N\;×\;15}\) = \(\frac{25%}{75%}\)

N = 60 men total required                

20 already working

⸫ 60 - 20 = 40 men extra required