On Friday, there were 20 more children than adults at the theme park. On Saturday, the number of children increased by 90% and the number of adults decreased by 70%. There were 148 people on Saturday. How many adults were there on Friday?
|
Children |
Adults |
Total |
Comparing children and adults at first |
20 more |
|
|
Before |
10 u |
+ 20 |
10 u |
|
Change |
+ 9 u |
+ 18 |
- 7 u |
|
After |
19 u |
+ 38 |
3 u |
148 |
90% =
90100 =
910 90% x 20 =
910 x 20 = 18
20 + 18 = 38
70% =
70100 =
710 Total number of people on Saturday
= 19 u + 38 + 3 u
= 22 u + 38
22 u + 38 = 148
22 u = 148 - 38
22 u = 110
1 u = 110 ÷ 22 = 5
Number of adults on Friday
= 10 u
= 10 x 5
= 50
Answer(s): 50