There was an equal number of girls and boys at the music room. After
49 of the girls and 34 boys left the music room, there were 18 more girls than boys at the music room. How many students were there at the music room at first?
| |
Girls |
Boys |
| Before |
9 u |
9 u |
| Change |
- 4 u |
- 34 |
| After |
5 u |
9 u - 34 |
Number of girls in the end
= 9 u - 4 u
= 5 u
If another 18 boys entered the music room, the number of girls and boys would be the same.
9 u - 34 + 18 = 5 u
9 u - 16 = 5 u
9 u - 5 u = 16
4 u = 16
1 u = 16 ÷ 4 = 4
Number of students in the music room at first
= 18 u
= 18 x 4
= 72
Answer(s): 72
