Twenty minutes ago, 60% of the students in a parade square were girls. 19 more students entered the parade square. As a result, the number of girls increased by 40% and the number of boys increased by 90%. How many students are in the parade square now?
| |
Girls |
Boys |
Total |
| Before |
5 u |
2 u |
7 u |
| Change |
+ 2 u |
+ 1.8 u |
+ 3.8 u |
| After |
7 u |
3.8 u |
10.8 u |
60% =
60100 =
35Number of more girls who entered the parade square
= 40% x 5 u
=
40100 x 5 u
= 2 u
Number of more boys who entered the parade square
= 90% x 2 u
=
90100 x 2 u
= 1.8 u
Total number of more students who entered the parade square
= 2 u + 1.8 u
= 3.8 u
3.8 u = 19
1 u = 19 ÷ 3.8 = 5
Number of students in the parade square now
= 7 u + 3.8 u
= 10.8 u
= 10.8 x 5
= 54
Answer(s): 54
