The number of girls in the canteen was
25 that of the boys. There were 111 more boys than girls. After some boys had left the canteen, the number of girls at the canteen was twice the number of the remaining boys. How many boys left the canteen?
| |
Boys |
Girls |
Difference |
| Before |
5 u |
2 u |
3 u |
| Change |
- ? |
|
|
| After |
1 u |
2 u |
|
The number of girls at first and in the end remains unchanged.
Number of more boys than girls at first
= 5 u - 2 u
= 3 u
3 u = 111
1 u = 111 ÷ 3 = 37
Number of boys that left
= 5 u - 1 u
= 4 u
= 4 x 37
= 148
Answer(s): 148
