On Friday, there were 10 more adults than children at the theme park. On Saturday, the number of adults increased by 70% and the number of children decreased by 90%. There were 215 people on Saturday. How many children were there on Friday?
| |
Adults |
Children |
Total |
Comparing adults
and children at first |
10 more |
|
|
| Before |
10 u |
+ 10 |
10 u |
|
| Change |
+ 7 u |
+ 7 |
- 9 u |
|
| After |
17 u |
+ 17 |
1 u |
215 |
70% =
70100 =
710 70% x 10 =
710 x 10 = 7
10 + 7 = 17
90% =
90100 =
910 Total number of people on Saturday
= 17 u + 17 + 1 u
= 18 u + 17
18 u + 17 = 215
18 u = 215 - 17
18 u = 198
1 u = 198 ÷ 18 = 11
Number of children on Friday
= 10 u
= 10 x 11
= 110
Answer(s): 110
