The number of boys in the auditorium was
47 that of the girls. There were 126 more girls than boys. After some girls had left the auditorium, the number of boys at the auditorium was four times the number of the remaining girls. How many girls left the auditorium?
|
Girls |
Boys |
Difference |
Before |
7 u |
4 u |
3 u |
Change |
- ? |
|
|
After |
1 u |
4 u |
|
The number of boys at first and in the end remains unchanged.
Number of more girls than boys at first
= 7 u - 4 u
= 3 u
3 u = 126
1 u = 126 ÷ 3 = 42
Number of girls that left
= 7 u - 1 u
= 6 u
= 6 x 42
= 252
Answer(s): 252