Seventeen minutes ago, 70% of the pupils in a parade square were girls. 122 more pupils entered the parade square. As a result, the number of girls increased by 40% and the number of boys increased by 70%. How many pupils are in the parade square now?
|
Girls |
Boys |
Total |
Before |
10 u |
3 u |
13 u |
Change |
+ 4 u |
+ 2.1 u |
+ 6.1 u |
After |
14 u |
5.1 u |
19.1 u |
70% =
70100 =
710Number of more girls who entered the parade square
= 40% x 10 u
=
40100 x 10 u
= 4 u
Number of more boys who entered the parade square
= 70% x 3 u
=
70100 x 3 u
= 2.1 u
Total number of more pupils who entered the parade square
= 4 u + 2.1 u
= 6.1 u
6.1 u = 122
1 u = 122 ÷ 6.1 = 20
Number of pupils in the parade square now
= 14 u + 5.1 u
= 19.1 u
= 19.1 x 20
= 382
Answer(s): 382