At a school, there were 55 boys from Club H and 20% more boys from Club J. Some boys from Club J left and the ratio of the number of boys from Club H to the number of boys from Club J became 5 : 2. How many boys from Club J left?
| |
Club H |
Club J |
| Before |
55 |
66 |
| Change |
|
- ? |
| After |
5 u |
2 u |
Number of boys from Club J at first in percent
= 100% + 20%
= 120%
Number of boys from Club J at first
= 120% x 55
=
120100 x 55
= 66
Number of boys in Club H remains unchanged.
5 u = 55
1 u = 55 ÷ 5 = 11
Number of boys from Club J in the end
= 2 u
= 2 x 11
= 22
Number of boys from Club J who left
= 66 - 22
= 44
Answer(s): 44
