75% of the children in the stadium were girls. After 52 girls and 4 boys left, the remaining children formed groups of 8. In each group, there were 3 boys. How many children were there in the stadium at first?
Solution
Note - "Before" for girls is 3 parts, while "Before" for boys is 1 part. This is to represent 75% girls and 25% boys, before 52 girls and 4 boys left.
From the table above
4 units --> 40
1 unit --> 40 divided by 4 = 10
Total boys (after)
3 units --> 3 x 10 = 30
Total girls (after)
5 units --> 5 x 10 = 50
Total children (after)
30 + 50 = 80
Total children at first
80 + 52 + 4 = 136
Answer: 136 children
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