In a hall,
12 of the children wore scarves. After 8 children who wore scarves left the hall, the percentage of children who wore scarves decreased to 30%. How many children in the hall did not wear scarves?
|
Wore scarves |
Did not wear scarves |
Before |
1x7 = 7 u |
1x7 = 7 u |
Change |
- 8 |
|
After |
3x1 = 3 u |
7x1 = 7 u |
30% =
30100 =
310The number of children who did not wear scarves remains unchanged. LCM of 1 and 7 is 7.
Number of children who wore scarves and left
= 7 u - 3 u
= 4 u
4 u = 8
1 u = 8 ÷ 4 = 2
Number of children who did not wear scarves
= 7 u
= 7 x 2
= 14
Answer(s): 14