Fourteen minutes ago, 70% of the students in a school field were girls. 57 more students entered the school field. As a result, the number of girls increased by 30% and the number of boys increased by 90%. How many students are in the school field now?
| |
Girls |
Boys |
Total |
| Before |
10 u |
3 u |
13 u |
| Change |
+ 3 u |
+ 2.7 u |
+ 5.7 u |
| After |
13 u |
5.7 u |
18.7 u |
70% =
70100 =
710Number of more girls who entered the school field
= 30% x 10 u
=
30100 x 10 u
= 3 u
Number of more boys who entered the school field
= 90% x 3 u
=
90100 x 3 u
= 2.7 u
Total number of more students who entered the school field
= 3 u + 2.7 u
= 5.7 u
5.7 u = 57
1 u = 57 ÷ 5.7 = 10
Number of students in the school field now
= 13 u + 5.7 u
= 18.7 u
= 18.7 x 10
= 187
Answer(s): 187
