At a school, there were 40 pupils from Club K and 40% more pupils from Club L. Some pupils from Club L left and the ratio of the number of pupils from Club K to the number of pupils from Club L became 5 : 3. How many pupils from Club L left?
| |
Club K |
Club L |
| Before |
40 |
56 |
| Change |
|
- ? |
| After |
5 u |
3 u |
Number of pupils from Club L at first in percent
= 100% + 40%
= 140%
Number of pupils from Club L at first
= 140% x 40
=
140100 x 40
= 56
Number of pupils in Club K remains unchanged.
5 u = 40
1 u = 40 ÷ 5 = 8
Number of pupils from Club L in the end
= 3 u
= 3 x 8
= 24
Number of pupils from Club L who left
= 56 - 24
= 32
Answer(s): 32
