On Friday, there were 40 more adults than children at the laser tag park. On Saturday, the number of adults increased by 80% and the number of children decreased by 60%. There were 204 people on Saturday. How many children were there on Friday?
| |
Adults |
Children |
Total |
Comparing adults
and children at first |
40 more |
|
|
| Before |
5 u |
+ 40 |
5 u |
|
| Change |
+ 4 u |
+ 32 |
- 3 u |
|
| After |
9 u |
+ 72 |
2 u |
204 |
80% =
80100 =
45 80% x 40 =
45 x 40 = 32
40 + 32 = 72
60% =
60100 =
35 Total number of people on Saturday
= 9 u + 72 + 2 u
= 11 u + 72
11 u + 72 = 204
11 u = 204 - 72
11 u = 132
1 u = 132 ÷ 11 = 12
Number of children on Friday
= 5 u
= 5 x 12
= 60
Answer(s): 60
