Question

if 20 men do a piece of work in 8 days .how many men will do a work in 10 days ?

Answer 1

The speed of 1 worker:

$$\frac{1}{20\cdot 8}=\frac{1}{160}\frac{1}{day}$$

The number of workers will be:

\frac{1}{\frac{1}{160}10}=16\