On Saturday, there were 20 more adults than children at the laser tag park. On Sunday, the number of adults decreased by 85% and the number of children decreased by 55%. There were 147 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 |
- 17 u |
- 17 |
- 11 u |
|
| After |
3 u |
+ 3 |
9 u |
147 |
85% =
85100 =
1720 85% x 20 =
1720 x 20 = 17
20 - 17 = 3
55% =
55100 =
1120 Total number of people on Sunday
= 3 u + 3 + 9 u
= 12 u + 3
12 u + 3 = 147
12 u = 147 - 3
12 u = 144
1 u = 144 ÷ 12 = 12
Number of adults on Sunday
= 3 u + 3
= 3 x 12 + 3
= 36 + 3
= 39
Answer(s): 39
