At a school, there were 50 girls from Club N and 40% more girls from Club P. Some girls from Club P left and the ratio of the number of girls from Club N to the number of girls from Club P became 5 : 3. How many girls from Club P left?
| |
Club N |
Club P |
| Before |
50 |
70 |
| Change |
|
- ? |
| After |
5 u |
3 u |
Number of girls from Club P at first in percent
= 100% + 40%
= 140%
Number of girls from Club P at first
= 140% x 50
=
140100 x 50
= 70
Number of girls in Club N remains unchanged.
5 u = 50
1 u = 50 ÷ 5 = 10
Number of girls from Club P in the end
= 3 u
= 3 x 10
= 30
Number of girls from Club P who left
= 70 - 30
= 40
Answer(s): 40
