Seventeen minutes ago, 60% of the pupils in a school field were girls. 28 more pupils entered the school field. As a result, the number of girls increased by 40% and the number of boys increased by 75%. How many pupils are in the school field now?
| |
Girls |
Boys |
Total |
| Before |
5 u |
2 u |
7 u |
| Change |
+ 2 u |
+ 1.5 u |
+ 3.5 u |
| After |
7 u |
3.5 u |
10.5 u |
60% =
60100 =
35Number of more girls who entered the school field
= 40% x 5 u
=
40100 x 5 u
= 2 u
Number of more boys who entered the school field
= 75% x 2 u
=
75100 x 2 u
= 1.5 u
Total number of more pupils who entered the school field
= 2 u + 1.5 u
= 3.5 u
3.5 u = 28
1 u = 28 ÷ 3.5 = 8
Number of pupils in the school field now
= 7 u + 3.5 u
= 10.5 u
= 10.5 x 8
= 84
Answer(s): 84
