if the ratio of boys to girls in a school is 1:7 how many boys are there in the school if there are 191 girls

Answer 1

It is easier to think about this in terms of fractions.

If the ratio is 1:7, then one out of every eight students is a boy (seven of the eight are girls).

So 1/8 of students are boys.

To find an eighth of 191, multiply (1/8)*191. You get 23.875.

But assuming there isn't 0.875th of a boy walking around school, I would round to 24 boys.

Answer 2

I believe you typed the number of girls incorrectly. If you use 191 in the problem, you get a fraction for the number of boys. However, if there are 161 girls - do the following:

Let b = the number of boys

boys/girls: b/161 = 1/7

7b = 161

b = 23 boys