On Saturday, there were 30 more adults than children at the fair. On Sunday, the number of adults increased by 90% and the number of children decreased by 70%. There were 321 people on Sunday. How many children were there on Saturday?
|
Adults |
Children |
Total |
Comparing adults and children at first |
30 more |
|
|
Before |
10 u |
+ 30 |
10 u |
|
Change |
+ 9 u |
+ 27 |
- 7 u |
|
After |
19 u |
+ 57 |
3 u |
321 |
90% =
90100 =
910 90% x 30 =
910 x 30 = 27
30 + 27 = 57
70% =
70100 =
710 Total number of people on Sunday
= 19 u + 57 + 3 u
= 22 u + 57
22 u + 57 = 321
22 u = 321 - 57
22 u = 264
1 u = 264 ÷ 22 = 12
Number of children on Saturday
= 10 u
= 10 x 12
= 120
Answer(s): 120