There was an equal number of girls and boys at the canteen. After
35 of the girls and 53 boys left the canteen, there were 23 more girls than boys at the canteen. How many pupils were there at the canteen at first?
| |
Girls |
Boys |
| Before |
5 u |
5 u |
| Change |
- 3 u |
- 53 |
| After |
2 u |
5 u - 53 |
Number of girls in the end
= 5 u - 3 u
= 2 u
If another 23 boys entered the canteen, the number of girls and boys would be the same.
5 u - 53 + 23 = 2 u
5 u - 30 = 2 u
5 u - 2 u = 30
3 u = 30
1 u = 30 ÷ 3 = 10
Number of pupils in the canteen at first
= 10 u
= 10 x 10
= 100
Answer(s): 100
