A road of 8 km length will be constructed in 75 days by 180 workers. But after 55 days it was found that only 6.6 km road was completed. Now how many people were needed to finish the work in the specified time?

105

Remaining work = 8 - 6.6 = 1.4 km

D₂  = 75 - 55 = 20 days

M₁ × D₁ × W₂ = M₂ × D₂ × W₁

180 × 55 × 1.4 =  M₂  ×  20 × 6.6 

M₂ = \(\frac{180\; ×\; 55 \;× \;1.4 }{ 20\; × \;6.6  }\)

M₂ = 105