532 people went to a tourist attraction.
47 were adults. Some children joined halfway and the ratio of the number of adults to the number of children became 16 : 15. How many children joined the tourist attraction halfway?
| |
Adults |
Children |
Total |
| Before |
4x4 =
16 u |
3x4 =
12 u |
7x4 =
28 u |
| Change |
|
+ ? |
|
| After |
16 u |
15 u |
|
Fraction of the people that were children at first
= 1 -
47 =
37 Number of adults remains unchanged. Make the number of adults the same. LCM of 4 and 16 is 16.
Total number of people at first = 28 u
28 u = 532
1 u = 532 ÷ 28 = 19
Number of children who joined halfway
= 15 u - 12 u
= 3 u
= 3 x 19
= 57
Answer(s): 57
