On Friday, there were 40 more adults than children at the trampoline park. On Saturday, the number of adults increased by 55% and the number of children increased by 85%. There were 810 people on Saturday. How many adults were there on Friday?
| |
Adults |
Children |
Total |
Comparing adults
and children at first |
40 more |
|
|
| Before |
20 u |
+ 40 |
20 u |
|
| Change |
+ 11 u |
+ 22 |
+ 17 u |
|
| After |
31 u |
+ 62 |
37 u |
810 |
55% =
55100 =
1120 55% x 40 =
1120 x 40 = 22
40 + 22 = 62
85% =
85100 =
1720 Total number of people on Saturday
= 31 u + 62 + 37 u
= 68 u + 62
68 u + 62 = 810
68 u = 810 - 62
68 u = 748
1 u = 748 ÷ 68 = 11
Number of adults on Friday
= 20 u + 40
= 20 x 11 + 40
= 220 + 40
= 260
Answer(s): 260
