On Friday, there were 25 more adults than children at the laser tag park. On Saturday, the number of adults increased by 60% and the number of children decreased by 80%. There were 85 people on Saturday. How many children were there on Friday?
| |
Adults |
Children |
Total |
Comparing adults
and children at first |
25 more |
|
|
| Before |
5 u |
+ 25 |
5 u |
|
| Change |
+ 3 u |
+ 15 |
- 4 u |
|
| After |
8 u |
+ 40 |
1 u |
85 |
60% =
60100 =
35 60% x 25 =
35 x 25 = 15
25 + 15 = 40
80% =
80100 =
45 Total number of people on Saturday
= 8 u + 40 + 1 u
= 9 u + 40
9 u + 40 = 85
9 u = 85 - 40
9 u = 45
1 u = 45 ÷ 9 = 5
Number of children on Friday
= 5 u
= 5 x 5
= 25
Answer(s): 25
