In a canteen,
16 of the girls wore cardigans. After 117 girls who wore cardigans entered the canteen, the percentage of girls who wore cardigans increased to 60%. How many girls in the canteen did not wear cardigans?
| |
Wore cardigans |
Did not wear cardigans |
| Before |
1x2 =
2 u |
5x2 =
10 u |
| Change |
+ 117 |
|
| After |
3x5 =
15 u |
2x5 =
10 u |
60% =
60100 =
35The number of girls who did not wear cardigans remains unchanged. LCM of 5 and 2 is 10.
Number of girls who wore cardigans and left
= 15 u - 2 u
= 13 u
13 u = 117
1 u = 117 ÷ 13 = 9
Number of girls who did not wear cardigans
= 10 u
= 10 x 9
= 90
Answer(s): 90
