Eight minutes ago, 60% of the pupils in a tuckshop were girls. 5 more pupils entered the tuckshop. As a result, the number of girls increased by 20% and the number of boys increased by 75%. How many pupils are in the tuckshop now?
| |
Girls |
Boys |
Total |
| Before |
5 u |
2 u |
7 u |
| Change |
+ 1 u |
+ 1.5 u |
+ 2.5 u |
| After |
6 u |
3.5 u |
9.5 u |
60% =
60100 =
35Number of more girls who entered the tuckshop
= 20% x 5 u
=
20100 x 5 u
= 1 u
Number of more boys who entered the tuckshop
= 75% x 2 u
=
75100 x 2 u
= 1.5 u
Total number of more pupils who entered the tuckshop
= 1 u + 1.5 u
= 2.5 u
2.5 u = 5
1 u = 5 ÷ 2.5 = 2
Number of pupils in the tuckshop now
= 6 u + 3.5 u
= 9.5 u
= 9.5 x 2
= 19
Answer(s): 19
