On Wednesday, there were 20 more children than adults at the night market. On Thursday, the number of children decreased by 70% and the number of adults decreased by 90%. There were 50 people on Thursday. How many children were there on Thursday?
| |
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 |
50 |
70% =
70100 =
710 70% x 20 =
710 x 20 = 14
20 - 14 = 6
90% =
90100 =
910 Total number of people on Thursday
= 3 u + 6 + 1 u
= 4 u + 6
4 u + 6 = 50
4 u = 50 - 6
4 u = 44
1 u = 44 ÷ 4 = 11
Number of children on Thursday
= 3 u + 6
= 3 x 11 + 6
= 33 + 6
= 39
Answer(s): 39
