Question

18
(a) The ratio of boys to girls in a class is 4:5.
What fraction of the class are boys?​

Answer 1

Answer:

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Step-by-step explanation:

For every 4 boys, there are 5 girls.

Therefore, out of every 9 students, 4 are boys.

 

Therefore, 4/9 of the students are boys.

Formally....

The ratio of boys to girls is 4:5.

So let 4x be the number of boys and 5x be the number of girls.

Then 4x+5x = 9x is the total number of students.

Then the fraction of boys in the class is 4x/9x = 4/9.