On Thursday, there were 20 more adults than children at the theme park. On Friday, the number of adults decreased by 90% and the number of children decreased by 70%. There were 22 people on Friday. How many adults were there on Friday?
|
Adults |
Children |
Total |
Comparing adults and children at first |
20 more |
|
|
Before |
10 u |
+ 20 |
10 u |
|
Change |
- 9 u |
- 18 |
- 7 u |
|
After |
1 u |
+ 2 |
3 u |
22 |
90% =
90100 =
910 90% x 20 =
910 x 20 = 18
20 - 18 = 2
70% =
70100 =
710 Total number of people on Friday
= 1 u + 2 + 3 u
= 4 u + 2
4 u + 2 = 22
4 u = 22 - 2
4 u = 20
1 u = 20 ÷ 4 = 5
Number of adults on Friday
= 1 u + 2
= 1 x 5 + 2
= 5 + 2
= 7
Answer(s): 7