On Friday, there were 20 more adults than children at the trampoline park. On Saturday, the number of adults increased by 65% and the number of children increased by 55%. There were 481 people on Saturday. How many adults were there on Friday?
| |
Adults |
Children |
Total |
Comparing adults
and children at first |
20 more |
|
|
| Before |
20 u |
+ 20 |
20 u |
|
| Change |
+ 13 u |
+ 13 |
+ 11 u |
|
| After |
33 u |
+ 33 |
31 u |
481 |
65% =
65100 =
1320 65% x 20 =
1320 x 20 = 13
20 + 13 = 33
55% =
55100 =
1120 Total number of people on Saturday
= 33 u + 33 + 31 u
= 64 u + 33
64 u + 33 = 481
64 u = 481 - 33
64 u = 448
1 u = 448 ÷ 64 = 7
Number of adults on Friday
= 20 u + 20
= 20 x 7 + 20
= 140 + 20
= 160
Answer(s): 160
