In a school field,
58 of the children wore scarves. After 49 children who wore scarves entered the school field, the percentage of children who wore scarves increased to 80%. How many children in the school field did not wear scarves?
|
Wore scarves |
Did not wear scarves |
Before |
5x1 = 5 u |
3x1 = 3 u |
Change |
+ 49 |
|
After |
4x3 = 12 u |
1x3 = 3 u |
80% =
80100 =
45The number of children who did not wear scarves remains unchanged. LCM of 3 and 1 is 3.
Number of children who wore scarves and left
= 12 u - 5 u
= 7 u
7 u = 49
1 u = 49 ÷ 7 = 7
Number of children who did not wear scarves
= 3 u
= 3 x 7
= 21
Answer(s): 21