Question

5) Answer the following questions :

The total number of boys and girls in a school is 320. the
number of boys in this school is 180 find :
a) The ratio between the number of boys and that of girls.
b) The ratio between the number of boys & the total number of
pupils.
c)The ratio between the number of girls & the total number of
pupils.
​

Answer 1

a) 9:7 (9 being the boys,7 being the girls)

b)9:16 (9 being boys, 16 being the total pupils)

c)7:16 (7 being girls, 16 being the total pupils)

Explanation:

a) No. of girls= 320-180

=140

Boys: Girls

180 : 140 [ ÷ 20]

9 : 7

b) Boys: Pupils

180 : 320 [ ÷ 20]

9 : 16

c). Girls: Pupils

140 : 320 [ ÷ 20]

7 : 16

Answer 2

a)9:7 b) 9:16 c) 7:16

Explanation:

the no of girls (320-180)=140

a) ratio of no of boys and girls=180/140=9/7=9:7

b)ratio of boys and total pupil=180/320=9/16=9:16

c) ratio of the girls and pupils=140/320=7/16=7:16