Question

$12$ farmers harvest the crops in the field in $20$ hours. How many workers will be required to do the same work in $15$ hours

Answer 1

$12$ farmers harvest crop in $20$ hours.

that means,

$12\times 20$ farmers harvest crop in 1 hour.

that means,

$\frac{12\times 20}{15}$ farmers harvest crop in 15 hours.

total farmers $=\frac{12\times 20}{15}$

$=16$ farmers.