In a basketball court,
310 of the children wore scarves. After 175 children who wore scarves entered the basketball court, the percentage of children who wore scarves increased to 80%. How many children in the basketball court did not wear scarves?
|
Wore scarves |
Did not wear scarves |
Before |
3x1 = 3 u |
7x1 = 7 u |
Change |
+ 175 |
|
After |
4x7 = 28 u |
1x7 = 7 u |
80% =
80100 =
45The number of children who did not wear scarves remains unchanged. LCM of 7 and 1 is 7.
Number of children who wore scarves and left
= 28 u - 3 u
= 25 u
25 u = 175
1 u = 175 ÷ 25 = 7
Number of children who did not wear scarves
= 7 u
= 7 x 7
= 49
Answer(s): 49