On Wednesday, there were 10 more adults than children at the laser tag park. On Thursday, the number of adults decreased by 70% and the number of children decreased by 90%. There were 27 people on Thursday. How many adults were there on Thursday?
| |
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 |
27 |
70% =
70100 =
710 70% x 10 =
710 x 10 = 7
10 - 7 = 3
90% =
90100 =
910 Total number of people on Thursday
= 3 u + 3 + 1 u
= 4 u + 3
4 u + 3 = 27
4 u = 27 - 3
4 u = 24
1 u = 24 ÷ 4 = 6
Number of adults on Thursday
= 3 u + 3
= 3 x 6 + 3
= 18 + 3
= 21
Answer(s): 21
