Nine minutes ago, 60% of the pupils in a canteen were boys. 17 more pupils entered the canteen. As a result, the number of boys increased by 40% and the number of girls increased by 70%. How many pupils are in the canteen now?
|
Boys |
Girls |
Total |
Before |
5 u |
2 u |
7 u |
Change |
+ 2 u |
+ 1.4 u |
+ 3.4 u |
After |
7 u |
3.4 u |
10.4 u |
60% =
60100 =
35Number of more boys who entered the canteen
= 40% x 5 u
=
40100 x 5 u
= 2 u
Number of more girls who entered the canteen
= 70% x 2 u
=
70100 x 2 u
= 1.4 u
Total number of more pupils who entered the canteen
= 2 u + 1.4 u
= 3.4 u
3.4 u = 17
1 u = 17 ÷ 3.4 = 5
Number of pupils in the canteen now
= 7 u + 3.4 u
= 10.4 u
= 10.4 x 5
= 52
Answer(s): 52