In a parade square,
110 of the girls wore cardigans. After 385 girls who wore cardigans entered the parade square, the percentage of girls who wore cardigans increased to 80%. How many girls in the parade square did not wear cardigans?
|
Wore cardigans |
Did not wear cardigans |
Before |
1x1 = 1 u |
9x1 = 9 u |
Change |
+ 385 |
|
After |
4x9 = 36 u |
1x9 = 9 u |
80% =
80100 =
45The number of girls who did not wear cardigans remains unchanged. LCM of 9 and 1 is 9.
Number of girls who wore cardigans and left
= 36 u - 1 u
= 35 u
35 u = 385
1 u = 385 ÷ 35 = 11
Number of girls who did not wear cardigans
= 9 u
= 9 x 11
= 99
Answer(s): 99