On Friday, there were 15 more children than adults at the trampoline park. On Saturday, the number of children increased by 60% and the number of adults decreased by 80%. There were 96 people on Saturday. How many adults were there on Friday?
| |
Children |
Adults |
Total |
Comparing children
and adults at first |
15 more |
|
|
| Before |
5 u |
+ 15 |
5 u |
|
| Change |
+ 3 u |
+ 9 |
- 4 u |
|
| After |
8 u |
+ 24 |
1 u |
96 |
60% =
60100 =
35 60% x 15 =
35 x 15 = 9
15 + 9 = 24
80% =
80100 =
45 Total number of people on Saturday
= 8 u + 24 + 1 u
= 9 u + 24
9 u + 24 = 96
9 u = 96 - 24
9 u = 72
1 u = 72 ÷ 9 = 8
Number of adults on Friday
= 5 u
= 5 x 8
= 40
Answer(s): 40
