At the bird park, there were
17 as many boys as girls. After 75 boys came and 15 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 |
1 u |
7 u |
Change |
+ 75 |
- 15 |
After |
1 u + 75 |
7 u - 15 |
Number of children in the end is the same.
7 u - 15 = 1 u + 75
7 u - 1 u = 75 + 15
6 u = 90
1 u = 90 ÷ 6 = 15
Number of children in the end
= 2 x (1 u + 75)
= 2 u + 150
= 2 x 15 + 150
= 30 + 150
= 180
Answer(s): 180