There was an equal number of girls and boys at the music room. After
37 of the girls and 48 boys left the music room, there were 15 more girls than boys at the music room. How many students were there at the music room at first?
| |
Girls |
Boys |
| Before |
7 u |
7 u |
| Change |
- 3 u |
- 48 |
| After |
4 u |
7 u - 48 |
Number of girls in the end
= 7 u - 3 u
= 4 u
If another 15 boys entered the music room, the number of girls and boys would be the same.
7 u - 48 + 15 = 4 u
7 u - 33 = 4 u
7 u - 4 u = 33
3 u = 33
1 u = 33 ÷ 3 = 11
Number of students in the music room at first
= 14 u
= 14 x 11
= 154
Answer(s): 154
