On Saturday, there were 20 more adults than children at the night market. On Sunday, the number of adults decreased by 65% and the number of children decreased by 85%. There were 87 people on Sunday. How many adults were there on Sunday?
|
Adults |
Children |
Total |
Comparing adults and children at first |
20 more |
|
|
Before |
20 u |
+ 20 |
20 u |
|
Change |
- 13 u |
- 13 |
- 17 u |
|
After |
7 u |
+ 7 |
3 u |
87 |
65% =
65100 =
1320 65% x 20 =
1320 x 20 = 13
20 - 13 = 7
85% =
85100 =
1720 Total number of people on Sunday
= 7 u + 7 + 3 u
= 10 u + 7
10 u + 7 = 87
10 u = 87 - 7
10 u = 80
1 u = 80 ÷ 10 = 8
Number of adults on Sunday
= 7 u + 7
= 7 x 8 + 7
= 56 + 7
= 63
Answer(s): 63