On Thursday, there were 15 more adults than children at the theme park. On Friday, the number of adults decreased by 60% and the number of children decreased by 80%. There were 42 people on Friday. How many adults were there on Friday?
| |
Adults |
Children |
Total |
Comparing adults
and children at first |
15 more |
|
|
| Before |
5 u |
+ 15 |
5 u |
|
| Change |
- 3 u |
- 9 |
- 4 u |
|
| After |
2 u |
+ 6 |
1 u |
42 |
60% =
60100 =
35 60% x 15 =
35 x 15 = 9
15 - 9 = 6
80% =
80100 =
45 Total number of people on Friday
= 2 u + 6 + 1 u
= 3 u + 6
3 u + 6 = 42
3 u = 42 - 6
3 u = 36
1 u = 36 ÷ 3 = 12
Number of adults on Friday
= 2 u + 6
= 2 x 12 + 6
= 24 + 6
= 30
Answer(s): 30
