360 people went to a tourist attraction.
35 were adults. Some children joined halfway and the ratio of the number of adults to the number of children became 12 : 11. How many children joined the tourist attraction halfway?
|
Adults |
Children |
Total |
Before |
3x4 = 12 u |
2x4 = 8 u |
5x4 = 20 u |
Change |
|
+ ? |
|
After |
12 u |
11 u |
|
Fraction of the people that were children at first
= 1 -
35 =
25 Number of adults remains unchanged. Make the number of adults the same. LCM of 3 and 12 is 12.
Total number of people at first = 20 u
20 u = 360
1 u = 360 ÷ 20 = 18
Number of children who joined halfway
= 11 u - 8 u
= 3 u
= 3 x 18
= 54
Answer(s): 54