The number of girls in the auditorium was
35 that of the boys. There were 130 more boys than girls. After some boys had left the auditorium, the number of girls at the auditorium was thrice the number of the remaining boys. How many boys left the auditorium?
| |
Boys |
Girls |
Difference |
| Before |
5 u |
3 u |
2 u |
| Change |
- ? |
|
|
| After |
1 u |
3 u |
|
The number of girls at first and in the end remains unchanged.
Number of more boys than girls at first
= 5 u - 3 u
= 2 u
2 u = 130
1 u = 130 ÷ 2 = 65
Number of boys that left
= 5 u - 1 u
= 4 u
= 4 x 65
= 260
Answer(s): 260
