On Friday, there were 20 more children than adults at the trampoline park. On Saturday, the number of children increased by 55% and the number of adults decreased by 85%. There were 133 people on Saturday. How many adults were there on Friday?
| |
Children |
Adults |
Total |
Comparing children
and adults at first |
20 more |
|
|
| Before |
20 u |
+ 20 |
20 u |
|
| Change |
+ 11 u |
+ 11 |
- 17 u |
|
| After |
31 u |
+ 31 |
3 u |
133 |
55% =
55100 =
1120 55% x 20 =
1120 x 20 = 11
20 + 11 = 31
85% =
85100 =
1720 Total number of people on Saturday
= 31 u + 31 + 3 u
= 34 u + 31
34 u + 31 = 133
34 u = 133 - 31
34 u = 102
1 u = 102 ÷ 34 = 3
Number of adults on Friday
= 20 u
= 20 x 3
= 60
Answer(s): 60
