On Friday, there were 15 more children than adults at the fair. On Saturday, the number of children decreased by 60% and the number of adults decreased by 80%. There were 30 people on Saturday. How many children were there on Saturday?
| |
Children |
Adults |
Total |
Comparing children
and adults at first |
15 more |
|
|
| Before |
5 u |
+ 15 |
5 u |
|
| Change |
- 3 u |
- 9 |
- 4 u |
|
| After |
2 u |
+ 6 |
1 u |
30 |
60% =
60100 =
35 60% x 15 =
35 x 15 = 9
15 - 9 = 6
80% =
80100 =
45 Total number of people on Saturday
= 2 u + 6 + 1 u
= 3 u + 6
3 u + 6 = 30
3 u = 30 - 6
3 u = 24
1 u = 24 ÷ 3 = 8
Number of children on Saturday
= 2 u + 6
= 2 x 8 + 6
= 16 + 6
= 22
Answer(s): 22
