Question

If 9 workers can complete a piece of work in 20 days. How many workers should be added to complete the work in 15 days?​

Answer 1

12 workers can complete work in 15 days

Explanation:

let x be the number of workers to find

9 workers can complete work in 20 days

x workers can complete work in 15 days

x/9 = 20/15

x = 20/15 * 9

x = 12

thus, 12 workers can complete work in 15 days

Answer 2

3 workers

Explanation:

If 9 workers can complete a work in 20 days, that means that 3 workers can complete the work in 60 days. If we divide 60 by 4, we have to multiply the workers by 4. So we get 12 workers are needed to complete the work in 15 days. That means you have to add 3 more workers to complete the piece of work in 15 days.