In a school field,
110 of the boys wore scarves. After 480 boys who wore scarves entered the school field, the percentage of boys who wore scarves increased to 90%. How many boys in the school field did not wear scarves?
|
Wore scarves |
Did not wear scarves |
Before |
1x1 = 1 u |
9x1 = 9 u |
Change |
+ 480 |
|
After |
9x9 = 81 u |
1x9 = 9 u |
90% =
90100 =
910The number of boys who did not wear scarves remains unchanged. LCM of 9 and 1 is 9.
Number of boys who wore scarves and left
= 81 u - 1 u
= 80 u
80 u = 480
1 u = 480 ÷ 80 = 6
Number of boys who did not wear scarves
= 9 u
= 9 x 6
= 54
Answer(s): 54