Question

What number must be added to each term of the ratio 8:11 to make it 4 : 5?​

Answer 1

So add x to both digits as

(8+x):(11+x) = 4:5, or

4(11+x) = 5(8+x), or

44+4x = 40+5x, or

5x-4x = 44–40, or

x = 4.

Answer 2

Answer:

So 4 must be added at least to make the new ratio 4:5