At a school, there were 55 students from Club R and 40% less students from Club S. Some students joined Club S and the ratio of the number of students from Club R to the number of students from Club S became 5 : 4. How many students joined Club S?
| |
Club R |
Club S |
| Before |
55 |
33 |
| Change |
|
+ ? |
| After |
5 u |
4 u |
Number of students from Club S at first in percent
= 100% - 40%
= 60%
Number of students from Club S at first
= 60% x 55
=
60100 x 55
= 33
Number of students in Club R remains unchanged.
5 u = 55
1 u = 55 ÷ 5 = 11
Number of students from Club S in the end
= 4 u
= 4 x 11
= 44
Number of students joined Club S
= 44 - 33
= 11
Answer(s): 11
