At first, there were 440 more girls than boys at the bird park. By 2 p.m., a total of 264 girls and boys left the bird park. There were as many girls as boys who left the bird park. In the end, there were 6 times as many girls as boys who remained behind. How many girls were at the bird park at first?
| |
Girls |
Boys |
Difference |
| Before |
6 u + 132 |
1 u + 132 |
440 |
| Change |
- 132 |
- 132 |
|
| After |
6 u |
1 u |
5 u |
Since there was the same number of boys and girls that left, the difference between the number of boys and girls remains unchanged.
5 u = 440
1 u = 440 ÷ 5 = 88
Number of girls in the end
= 6 u
= 6 x 88
= 528
Number of girls that left
= 264 ÷ 2
= 132
Number of girls at first
= 528 + 132
= 660
Answer(s): 660
