Eight minutes ago, 70% of the pupils in a parade square were girls. 57 more pupils entered the parade square. As a result, the number of girls increased by 20% 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 |
+ 2 u |
+ 1.8 u |
+ 3.8 u |
| After |
12 u |
4.8 u |
16.8 u |
70% =
70100 =
710Number of more girls who entered the parade square
= 20% x 10 u
=
20100 x 10 u
= 2 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
= 2 u + 1.8 u
= 3.8 u
3.8 u = 57
1 u = 57 ÷ 3.8 = 15
Number of pupils in the parade square now
= 12 u + 4.8 u
= 16.8 u
= 16.8 x 15
= 252
Answer(s): 252
