On Wednesday, there were 30 more adults than children at the arcade. On Thursday, the number of adults increased by 80% and the number of children decreased by 60%. There were 87 people on Thursday. How many children were there on Wednesday?
| |
Adults |
Children |
Total |
Comparing adults
and children at first |
30 more |
|
|
| Before |
5 u |
+ 30 |
5 u |
|
| Change |
+ 4 u |
+ 24 |
- 3 u |
|
| After |
9 u |
+ 54 |
2 u |
87 |
80% =
80100 =
45 80% x 30 =
45 x 30 = 24
30 + 24 = 54
60% =
60100 =
35 Total number of people on Thursday
= 9 u + 54 + 2 u
= 11 u + 54
11 u + 54 = 87
11 u = 87 - 54
11 u = 33
1 u = 33 ÷ 11 = 3
Number of children on Wednesday
= 5 u
= 5 x 3
= 15
Answer(s): 15
