In a parade square,
12 of the children wore scarves. After 18 children who wore scarves left the parade square, the percentage of children who wore scarves decreased to 45%. How many children in the parade square did not wear scarves?
| |
Wore scarves |
Did not wear scarves |
| Before |
1x11 =
11 u |
1x11 =
11 u |
| Change |
- 18 |
|
| After |
9x1 =
9 u |
11x1 =
11 u |
45% =
45100 =
920The number of children who did not wear scarves remains unchanged. LCM of 1 and 11 is 11.
Number of children who wore scarves and left
= 11 u - 9 u
= 2 u
2 u = 18
1 u = 18 ÷ 2 = 9
Number of children who did not wear scarves
= 11 u
= 11 x 9
= 99
Answer(s): 99
