Question

1. In a small factory, for every seven unskilled workers,
three are skilled. If five skilled workers are replaced
by unskilled workers, the number of unskilled
workers will be four times the number of skilled
workers. What is the total number of workers?

Answer 1

Ratio is 7:3

let's take the number of unskilled workers as 7x and skilled workers as 3x.

So after replacement the numbers will be 7x+5 and 3x-5

So 7x+5=4(3x-5)

7x+5=12x-20

25=12x-7x=5x

x=25/5=5

7x=35

3x=15