In a hall,
19 of the students wore cardigans. After 248 students who wore cardigans entered the hall, the percentage of students who wore cardigans increased to 80%. How many students in the hall did not wear cardigans?
|
Wore cardigans |
Did not wear cardigans |
Before |
1x1 = 1 u |
8x1 = 8 u |
Change |
+ 248 |
|
After |
4x8 = 32 u |
1x8 = 8 u |
80% =
80100 =
45The number of students who did not wear cardigans remains unchanged. LCM of 8 and 1 is 8.
Number of students who wore cardigans and left
= 32 u - 1 u
= 31 u
31 u = 248
1 u = 248 ÷ 31 = 8
Number of students who did not wear cardigans
= 8 u
= 8 x 8
= 64
Answer(s): 64