On Friday, there were 10 more adults than children at the arcade. On Saturday, the number of adults decreased by 70% and the number of children decreased by 90%. There were 51 people on Saturday. How many adults were there on Saturday?
| |
Adults |
Children |
Total |
Comparing adults
and children at first |
10 more |
|
|
| Before |
10 u |
+ 10 |
10 u |
|
| Change |
- 7 u |
- 7 |
- 9 u |
|
| After |
3 u |
+ 3 |
1 u |
51 |
70% =
70100 =
710 70% x 10 =
710 x 10 = 7
10 - 7 = 3
90% =
90100 =
910 Total number of people on Saturday
= 3 u + 3 + 1 u
= 4 u + 3
4 u + 3 = 51
4 u = 51 - 3
4 u = 48
1 u = 48 ÷ 4 = 12
Number of adults on Saturday
= 3 u + 3
= 3 x 12 + 3
= 36 + 3
= 39
Answer(s): 39
