Question

(
What must be subtracted from
each term of the ratio 3:7 so that the ratio becomes 2:5
​

Answer 1

let the unknown number be x.

then

3/7-x=2/5

3/7-2/5=x

(15-14)/35=x

1/35=x

Answer 2

To Find the number -

Must be subtracted from each term of the ratio 3:7 so that the ratio becomes 2:5. We have to subtract x from the ratio 3:7.

So, let x is to subtracted.

$= \frac{3-x}{7-x} = \frac{2}{5}$

$= 15 - 5x = 14 - 2x\\= 5x - 2x = 15 - 14\\= 1 = 3x\\=> x = \frac{1}{3}$