Question

what is ratio and who to use ratio

Answer 1

Ratio is comparison between two things.
Ratio is used at Many place.
Suppose u got 5 stones
and your frnd got 7 Stone
then ratio of ur stones to his stones will be 5/7
and ratio of his stones to ur stones will be 7/5

Answer 2

Ratio many comparison between two things.

For example-
Number of girls: 15
Number of boys: 45
We first write it in a fraction form, i.e, 15/45 or 45/15

So,
The ratio of numbers of girls to boys will be 15/45. We will bring it to the lowest form.
15/45 = 1/3, so the ratio is 1:3 (pronunciation as 1 is to 3).

The ratio of numbers of boys to girls will be 45/15. We will bring it to the lowest form.
45/15= 3/1, so the ratio is 3:1 (pronunciation as 3 is to 1).