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