On Thursday, there were 10 more children than adults at the laser tag park. On Friday, the number of children increased by 60% and the number of adults decreased by 80%. There were 70 people on Friday. How many adults were there on Thursday?
| |
Children |
Adults |
Total |
Comparing children
and adults at first |
10 more |
|
|
| Before |
5 u |
+ 10 |
5 u |
|
| Change |
+ 3 u |
+ 6 |
- 4 u |
|
| After |
8 u |
+ 16 |
1 u |
70 |
60% =
60100 =
35 60% x 10 =
35 x 10 = 6
10 + 6 = 16
80% =
80100 =
45 Total number of people on Friday
= 8 u + 16 + 1 u
= 9 u + 16
9 u + 16 = 70
9 u = 70 - 16
9 u = 54
1 u = 54 ÷ 9 = 6
Number of adults on Thursday
= 5 u
= 5 x 6
= 30
Answer(s): 30
