In a basketball court,
710 of the children wore scarves. After 60 children who wore scarves entered the basketball court, the percentage of children who wore scarves increased to 90%. How many children in the basketball court did not wear scarves?
| |
Wore scarves |
Did not wear scarves |
| Before |
7x1 =
7 u |
3x1 =
3 u |
| Change |
+ 60 |
|
| After |
9x3 =
27 u |
1x3 =
3 u |
90% =
90100 =
910The 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
= 27 u - 7 u
= 20 u
20 u = 60
1 u = 60 ÷ 20 = 3
Number of children who did not wear scarves
= 3 u
= 3 x 3
= 9
Answer(s): 9
