Four minutes ago, 60% of the pupils in a canteen were girls. 52 more pupils entered the canteen. As a result, the number of girls increased by 20% and the number of boys increased by 80%. How many pupils are in the canteen now?
| |
Girls |
Boys |
Total |
| Before |
5 u |
2 u |
7 u |
| Change |
+ 1 u |
+ 1.6 u |
+ 2.6 u |
| After |
6 u |
3.6 u |
9.6 u |
60% =
60100 =
35Number of more girls who entered the canteen
= 20% x 5 u
=
20100 x 5 u
= 1 u
Number of more boys who entered the canteen
= 80% x 2 u
=
80100 x 2 u
= 1.6 u
Total number of more pupils who entered the canteen
= 1 u + 1.6 u
= 2.6 u
2.6 u = 52
1 u = 52 ÷ 2.6 = 20
Number of pupils in the canteen now
= 6 u + 3.6 u
= 9.6 u
= 9.6 x 20
= 192
Answer(s): 192
