Question

There are 840 pupils in a school. The ratio of boys to girls in the school is 5:7
Calcaulate
i) the number of boys
ii) the ratio of girls to pupils

Answer 1

Step-by-step explanation:

let no of boys = 5x

let no of girls = 7x

5x+7x = 840

12x = 840

x= 840/12

x=70

no of boys = 5x = 5×70= 350

no of girls = 7x= 7×70 = 490

ratio of girls to pupil = 490/840

= 7/12

7:12