On Friday, there were 35 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 137 people on Saturday. How many adults were there on Friday?
|
Children |
Adults |
Total |
Comparing children and adults at first |
35 more |
|
|
Before |
5 u |
+ 35 |
5 u |
|
Change |
+ 3 u |
+ 21 |
- 4 u |
|
After |
8 u |
+ 56 |
1 u |
137 |
60% =
60100 =
35 60% x 35 =
35 x 35 = 21
35 + 21 = 56
80% =
80100 =
45 Total number of people on Saturday
= 8 u + 56 + 1 u
= 9 u + 56
9 u + 56 = 137
9 u = 137 - 56
9 u = 81
1 u = 81 ÷ 9 = 9
Number of adults on Friday
= 5 u
= 5 x 9
= 45
Answer(s): 45