At the stadium, there were
311 as many boys as girls. After 75 boys came and 13 girls left the stadium, there was an equal number of boys and girls who remained at the stadium. How many children were at the stadium in the end?
|
Boys |
Girls |
Before |
3 u |
11 u |
Change |
+ 75 |
- 13 |
After |
3 u + 75 |
11 u - 13 |
Number of children in the end is the same.
11 u - 13 = 3 u + 75
11 u - 3 u = 75 + 13
8 u = 88
1 u = 88 ÷ 8 = 11
Number of children in the end
= 2 x (3 u + 75)
= 6 u + 150
= 6 x 11 + 150
= 66 + 150
= 216
Answer(s): 216