On Monday, there were 15 more children than adults at the laser tag park. On Tuesday, the number of children increased by 60% and the number of adults decreased by 80%. There were 87 people on Tuesday. How many adults were there on Monday?
|
Children |
Adults |
Total |
Comparing children and adults at first |
15 more |
|
|
Before |
5 u |
+ 15 |
5 u |
|
Change |
+ 3 u |
+ 9 |
- 4 u |
|
After |
8 u |
+ 24 |
1 u |
87 |
60% =
60100 =
35 60% x 15 =
35 x 15 = 9
15 + 9 = 24
80% =
80100 =
45 Total number of people on Tuesday
= 8 u + 24 + 1 u
= 9 u + 24
9 u + 24 = 87
9 u = 87 - 24
9 u = 63
1 u = 63 ÷ 9 = 7
Number of adults on Monday
= 5 u
= 5 x 7
= 35
Answer(s): 35