There was an equal number of girls and boys at the music room. After
58 of the girls and 35 boys left the music room, there were 10 more girls than boys at the music room. How many pupils were there at the music room at first?
| |
Girls |
Boys |
| Before |
8 u |
8 u |
| Change |
- 5 u |
- 35 |
| After |
3 u |
8 u - 35 |
Number of girls in the end
= 8 u - 5 u
= 3 u
If another 10 boys entered the music room, the number of girls and boys would be the same.
8 u - 35 + 10 = 3 u
8 u - 25 = 3 u
8 u - 3 u = 25
5 u = 25
1 u = 25 ÷ 5 = 5
Number of pupils in the music room at first
= 16 u
= 16 x 5
= 80
Answer(s): 80
