Question

15 workers can build a wall in $20days$. How many workers will build the wall in $12days$?

Answer 1

Find the number of workers:

Here days and workers are in inverse proportion.

In $20days$ number of workers can build a wall $=15$

In $1days$ number of workers can build a wall $=15\times 20=300$ (less days, more workers required)

In $12days$ number of workers can build a wall $=\frac{300}{12}=25$ ( more days, less workers required)

Hence, $25$ workers will build the wall in $12days$.