On Friday, there were 15 more children than adults at the trampoline park. On Saturday, the number of children increased by 80% and the number of adults increased by 60%. There were 180 people on Saturday. How many children were there on Friday?
| |
Children |
Adults |
Total |
Comparing children
and adults at first |
15 more |
|
|
| Before |
5 u |
+ 15 |
5 u |
|
| Change |
+ 4 u |
+ 12 |
+ 3 u |
|
| After |
9 u |
+ 27 |
8 u |
180 |
80% =
80100 =
45 80% x 15 =
45 x 15 = 12
15 + 12 = 27
60% =
60100 =
35 Total number of people on Saturday
= 9 u + 27 + 8 u
= 17 u + 27
17 u + 27 = 180
17 u = 180 - 27
17 u = 153
1 u = 153 ÷ 17 = 9
Number of children on Friday
= 5 u + 15
= 5 x 9 + 15
= 45 + 15
= 60
Answer(s): 60
