At a school, there were 36 pupils from Club C and 25% less pupils from Club D. Some pupils joined Club D and the ratio of the number of pupils from Club C to the number of pupils from Club D became 6 : 5. How many pupils joined Club D?
| |
Club C |
Club D |
| Before |
36 |
27 |
| Change |
|
+ ? |
| After |
6 u |
5 u |
Number of pupils from Club D at first in percent
= 100% - 25%
= 75%
Number of pupils from Club D at first
= 75% x 36
=
75100 x 36
= 27
Number of pupils in Club C remains unchanged.
6 u = 36
1 u = 36 ÷ 6 = 6
Number of pupils from Club D in the end
= 5 u
= 5 x 6
= 30
Number of pupils joined Club D
= 30 - 27
= 3
Answer(s): 3
