Please solve this question i have got exam next week?

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2 Answers
Jan 8, 2018

The ratio of boys: girls is 4:5

It means that if there are 9 students (4+5 which is the addition of ratios), then 4 are boys.

or 4 out of 9 students are boys.

It can be written as = 49 boys.

Now, it given that number of boys = 220

and we know that this 220 boys are 49 of the total students

Let the Total students attending the school = x

So, 49×x = 220

or 4x = 220×9 = 1980

or x = 19804 = 495 students

Jan 8, 2018

495 students

Explanation:

If the ratio of boys to girls is 4 : 5, then we know the following:

There are more girls than boys.

For every 4 boys there are 5 girls

The total number of students is a multiple of 9.

We could also state the question as:

Increase 220 in the ratio 9 : 4

This will give us the total number of students in one calculation.

220×94

=495 students

Note that dividing: 220÷4=55 tells us how many students one part represents.

So to find 9 parts: 55×9=495