On Friday, there were 30 more children than adults at the bowling alley. On Saturday, the number of children decreased by 80% and the number of adults decreased by 60%. There were 24 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 |
- 4 u |
- 24 |
- 3 u |
|
| After |
1 u |
+ 6 |
2 u |
24 |
80% =
80100 =
45 80% x 30 =
45 x 30 = 24
30 - 24 = 6
60% =
60100 =
35 Total number of people on Saturday
= 1 u + 6 + 2 u
= 3 u + 6
3 u + 6 = 24
3 u = 24 - 6
3 u = 18
1 u = 18 ÷ 3 = 6
Number of children on Saturday
= 1 u + 6
= 1 x 6 + 6
= 6 + 6
= 12
Answer(s): 12
