On Thursday, there were 40 more children than adults at the trampoline park. On Friday, the number of children decreased by 70% and the number of adults decreased by 90%. There were 28 people on Friday. How many children were there on Friday?
| |
Children |
Adults |
Total |
Comparing children
and adults at first |
40 more |
|
|
| Before |
10 u |
+ 40 |
10 u |
|
| Change |
- 7 u |
- 28 |
- 9 u |
|
| After |
3 u |
+ 12 |
1 u |
28 |
70% =
70100 =
710 70% x 40 =
710 x 40 = 28
40 - 28 = 12
90% =
90100 =
910 Total number of people on Friday
= 3 u + 12 + 1 u
= 4 u + 12
4 u + 12 = 28
4 u = 28 - 12
4 u = 16
1 u = 16 ÷ 4 = 4
Number of children on Friday
= 3 u + 12
= 3 x 4 + 12
= 12 + 12
= 24
Answer(s): 24
