Question

Ratio And Proportion

The ratio of boys to girls in 5th year is 2:5 if there are 140 pupils in total, how many boys and girls are there?

b)if The ratio of boys to girls in 3rd year is 5:4 , how many girls would there be when there are 120 boys?

Answer 1

1)
Data:


`(boys)/(girls) = (2)/(5)`
Total pupils = 140

Solving:


`140* (2)/(5) = (280)/(5) = 56boys`

`140 - 56 = 84girls`


2)

Data:


`(boys)/(girls) = (5)/(4)`
Total boys =120


`g* (5)/(4) = 120`

`(5g)/(4) = 120`

`5g = 120*4`

`5g = 480`

`g = (480)/(5)`
g = 96

Answer: 96 girls