The number of boys in the school hall was
58 that of the girls. There were 123 more girls than boys. After some girls had left the school hall, the number of boys at the school hall was five times the number of the remaining girls. How many girls left the school hall?
| |
Girls |
Boys |
Difference |
| Before |
8 u |
5 u |
3 u |
| Change |
- ? |
|
|
| After |
1 u |
5 u |
|
The number of boys at first and in the end remains unchanged.
Number of more girls than boys at first
= 8 u - 5 u
= 3 u
3 u = 123
1 u = 123 ÷ 3 = 41
Number of girls that left
= 8 u - 1 u
= 7 u
= 7 x 41
= 287
Answer(s): 287
