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?
Answer & explanation
Correct answer: option 2
\(\frac{M_1 × D_1}{M_2 × D_2}\) = \(\frac{Work_1}{Work_2}\)
ATQ,
\(\frac{20\;×\;15}{N\;×\;15}\) = \(\frac{25%}{75%}\)
N = 60 men total required
20 already working
⸫ 60 - 20 = 40 men extra required