In a canteen,
18 of the children wore scarves. After 558 children who wore scarves entered the canteen, the percentage of children who wore scarves increased to 90%. How many children in the canteen did not wear scarves?
|
Wore scarves |
Did not wear scarves |
Before |
1x1 = 1 u |
7x1 = 7 u |
Change |
+ 558 |
|
After |
9x7 = 63 u |
1x7 = 7 u |
90% =
90100 =
910The 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
= 63 u - 1 u
= 62 u
62 u = 558
1 u = 558 ÷ 62 = 9
Number of children who did not wear scarves
= 7 u
= 7 x 9
= 63
Answer(s): 63