On Friday, there were 20 more children than adults at the laser tag park. On Saturday, the number of children decreased by 80% and the number of adults decreased by 60%. There were 40 people on Saturday. How many children were there on Saturday?
|
Children |
Adults |
Total |
Comparing children and adults at first |
20 more |
|
|
Before |
5 u |
+ 20 |
5 u |
|
Change |
- 4 u |
- 16 |
- 3 u |
|
After |
1 u |
+ 4 |
2 u |
40 |
80% =
80100 =
45 80% x 20 =
45 x 20 = 16
20 - 16 = 4
60% =
60100 =
35 Total number of people on Saturday
= 1 u + 4 + 2 u
= 3 u + 4
3 u + 4 = 40
3 u = 40 - 4
3 u = 36
1 u = 36 ÷ 3 = 12
Number of children on Saturday
= 1 u + 4
= 1 x 12 + 4
= 12 + 4
= 16
Answer(s): 16