There was an equal number of girls and boys in the gymnasium. When 20% of the boys left the gymnasium, there were 9 more girls than boys remaining in the gymnasium. How many children remained in the gymnasium?
|
|
Girls
|
Boys
|
|
Before
|
5 u
|
5 u
|
|
Change
|
|
- 1 u
|
|
After
|
5 u
|
4 u
|
20% =
20100 =
15Number of boys in the end
= 5 u - 1 u
= 4 u
Number of more girls than boys remaining in the gymnasium
= 5 u - 4 u
= 1 u
1 u = 9
Total number of students remaining in the gymnasium
= 5 u + 4 u
= 9 u
= 9 x 9
= 81
Answer(s): 81
