On Friday, there were 30 more children than adults at the theme park. On Saturday, the number of children decreased by 60% and the number of adults decreased by 80%. There were 39 people on Saturday. How many children were there on Saturday?
| |
Children |
Adults |
Total |
Comparing children
and adults at first |
30 more |
|
|
| Before |
5 u |
+ 30 |
5 u |
|
| Change |
- 3 u |
- 18 |
- 4 u |
|
| After |
2 u |
+ 12 |
1 u |
39 |
60% =
60100 =
35 60% x 30 =
35 x 30 = 18
30 - 18 = 12
80% =
80100 =
45 Total number of people on Saturday
= 2 u + 12 + 1 u
= 3 u + 12
3 u + 12 = 39
3 u = 39 - 12
3 u = 27
1 u = 27 ÷ 3 = 9
Number of children on Saturday
= 2 u + 12
= 2 x 9 + 12
= 18 + 12
= 30
Answer(s): 30
