In a tuckshop,
35 of the girls wore cardigans. After 105 girls who wore cardigans entered the tuckshop, the percentage of girls who wore cardigans increased to 90%. How many girls in the tuckshop did not wear cardigans?
| |
Wore cardigans |
Did not wear cardigans |
| Before |
3x1 =
3 u |
2x1 =
2 u |
| Change |
+ 105 |
|
| After |
9x2 =
18 u |
1x2 =
2 u |
90% =
90100 =
910The number of girls who did not wear cardigans remains unchanged. LCM of 2 and 1 is 2.
Number of girls who wore cardigans and left
= 18 u - 3 u
= 15 u
15 u = 105
1 u = 105 ÷ 15 = 7
Number of girls who did not wear cardigans
= 2 u
= 2 x 7
= 14
Answer(s): 14
