Eighteen minutes ago, 70% of the pupils in a parade square were girls. 24 more pupils entered the parade square. As a result, the number of girls increased by 30% and the number of boys increased by 60%. How many pupils are in the parade square now?
| |
Girls |
Boys |
Total |
| Before |
10 u |
3 u |
13 u |
| Change |
+ 3 u |
+ 1.8 u |
+ 4.8 u |
| After |
13 u |
4.8 u |
17.8 u |
70% =
70100 =
710Number of more girls who entered the parade square
= 30% x 10 u
=
30100 x 10 u
= 3 u
Number of more boys who entered the parade square
= 60% x 3 u
=
60100 x 3 u
= 1.8 u
Total number of more pupils who entered the parade square
= 3 u + 1.8 u
= 4.8 u
4.8 u = 24
1 u = 24 ÷ 4.8 = 5
Number of pupils in the parade square now
= 13 u + 4.8 u
= 17.8 u
= 17.8 x 5
= 89
Answer(s): 89
