At the museum, there were
111 as many girls as boys. After 89 girls came and 21 boys left the museum, there was an equal number of girls and boys who remained at the museum. How many children were at the museum in the end?
| |
Girls |
Boys |
| Before |
1 u |
11 u |
| Change |
+ 89 |
- 21 |
| After |
1 u + 89 |
11 u - 21 |
Number of children in the end is the same.
11 u - 21 = 1 u + 89
11 u - 1 u = 89 + 21
10 u = 110
1 u = 110 ÷ 10 = 11
Number of children in the end
= 2 x (1 u + 89)
= 2 u + 178
= 2 x 11 + 178
= 22 + 178
= 200
Answer(s): 200
