At the bird park, there were
57 as many boys as girls. After 74 boys came and 36 girls left the bird park, there was an equal number of boys and girls who remained at the bird park. How many children were at the bird park in the end?
|
Boys |
Girls |
Before |
5 u |
7 u |
Change |
+ 74 |
- 36 |
After |
5 u + 74 |
7 u - 36 |
Number of children in the end is the same.
7 u - 36 = 5 u + 74
7 u - 5 u = 74 + 36
2 u = 110
1 u = 110 ÷ 2 = 55
Number of children in the end
= 2 x (5 u + 74)
= 10 u + 148
= 10 x 55 + 148
= 550 + 148
= 698
Answer(s): 698