On Friday, there were 30 more children than adults at the arcade. On Saturday, the number of children decreased by 70% and the number of adults decreased by 90%. There were 53 people on Saturday. How many children were there on Saturday?
| |
Children |
Adults |
Total |
Comparing children
and adults at first |
30 more |
|
|
| Before |
10 u |
+ 30 |
10 u |
|
| Change |
- 7 u |
- 21 |
- 9 u |
|
| After |
3 u |
+ 9 |
1 u |
53 |
70% =
70100 =
710 70% x 30 =
710 x 30 = 21
30 - 21 = 9
90% =
90100 =
910 Total number of people on Saturday
= 3 u + 9 + 1 u
= 4 u + 9
4 u + 9 = 53
4 u = 53 - 9
4 u = 44
1 u = 44 ÷ 4 = 11
Number of children on Saturday
= 3 u + 9
= 3 x 11 + 9
= 33 + 9
= 42
Answer(s): 42
