On Friday, there were 15 more adults than children at the theme park. On Saturday, the number of adults increased by 60% and the number of children increased by 80%. There were 109 people on Saturday. How many adults were there on Friday?
| |
Adults |
Children |
Total |
Comparing adults
and children at first |
15 more |
|
|
| Before |
5 u |
+ 15 |
5 u |
|
| Change |
+ 3 u |
+ 9 |
+ 4 u |
|
| After |
8 u |
+ 24 |
9 u |
109 |
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 + 9 u
= 17 u + 24
17 u + 24 = 109
17 u = 109 - 24
17 u = 85
1 u = 85 ÷ 17 = 5
Number of adults on Friday
= 5 u + 15
= 5 x 5 + 15
= 25 + 15
= 40
Answer(s): 40
