225 people went to a stadium.
25 were adults. Some children joined halfway and the ratio of the number of adults to the number of children became 6 : 13. How many children joined the stadium halfway?
| |
Adults |
Children |
Total |
| Before |
2x3 =
6 u |
3x3 =
9 u |
5x3 =
15 u |
| Change |
|
+ ? |
|
| After |
6 u |
13 u |
|
Fraction of the people that were children at first
= 1 -
25 =
35 Number of adults remains unchanged. Make the number of adults the same. LCM of 2 and 6 is 6.
Total number of people at first = 15 u
15 u = 225
1 u = 225 ÷ 15 = 15
Number of children who joined halfway
= 13 u - 9 u
= 4 u
= 4 x 15
= 60
Answer(s): 60
