In a tuckshop,
78 of the girls wore cardigans. After 132 girls who wore cardigans left the tuckshop, the percentage of girls who wore cardigans decreased to 60%. How many girls in the tuckshop did not wear cardigans?
| |
Wore cardigans |
Did not wear cardigans |
| Before |
7x2 =
14 u |
1x2 =
2 u |
| Change |
- 132 |
|
| After |
3x1 =
3 u |
2x1 =
2 u |
60% =
60100 =
35The number of girls who did not wear cardigans remains unchanged. LCM of 1 and 2 is 2.
Number of girls who wore cardigans and left
= 14 u - 3 u
= 11 u
11 u = 132
1 u = 132 ÷ 11 = 12
Number of girls who did not wear cardigans
= 2 u
= 2 x 12
= 24
Answer(s): 24
