At the theme park, there were
511 as many boys as girls. After 45 boys came and 15 girls left the theme park, there was an equal number of boys and girls who remained at the theme park. How many children were at the theme park in the end?
| |
Boys |
Girls |
| Before |
5 u |
11 u |
| Change |
+ 45 |
- 15 |
| After |
5 u + 45 |
11 u - 15 |
Number of children in the end is the same.
11 u - 15 = 5 u + 45
11 u - 5 u = 45 + 15
6 u = 60
1 u = 60 ÷ 6 = 10
Number of children in the end
= 2 x (5 u + 45)
= 10 u + 90
= 10 x 10 + 90
= 100 + 90
= 190
Answer(s): 190
