On Thursday, there were 30 more children than adults at the night market. On Friday, the number of children decreased by 70% and the number of adults decreased by 90%. There were 45 people on Friday. How many children were there on Friday?
| |
Children |
Adults |
Total |
Comparing children
and adults at first |
30 more |
|
|
| Before |
10 u |
+ 30 |
10 u |
|
| Change |
- 7 u |
- 21 |
- 9 u |
|
| After |
3 u |
+ 9 |
1 u |
45 |
70% =
70100 =
710 70% x 30 =
710 x 30 = 21
30 - 21 = 9
90% =
90100 =
910 Total number of people on Friday
= 3 u + 9 + 1 u
= 4 u + 9
4 u + 9 = 45
4 u = 45 - 9
4 u = 36
1 u = 36 ÷ 4 = 9
Number of children on Friday
= 3 u + 9
= 3 x 9 + 9
= 27 + 9
= 36
Answer(s): 36
