On Tuesday, there were 20 more children than adults at the fair. On Wednesday, the number of children decreased by 70% and the number of adults decreased by 90%. There were 38 people on Wednesday. How many children were there on Wednesday?
| |
Children |
Adults |
Total |
Comparing children
and adults at first |
20 more |
|
|
| Before |
10 u |
+ 20 |
10 u |
|
| Change |
- 7 u |
- 14 |
- 9 u |
|
| After |
3 u |
+ 6 |
1 u |
38 |
70% =
70100 =
710 70% x 20 =
710 x 20 = 14
20 - 14 = 6
90% =
90100 =
910 Total number of people on Wednesday
= 3 u + 6 + 1 u
= 4 u + 6
4 u + 6 = 38
4 u = 38 - 6
4 u = 32
1 u = 32 ÷ 4 = 8
Number of children on Wednesday
= 3 u + 6
= 3 x 8 + 6
= 24 + 6
= 30
Answer(s): 30
