In a tuckshop,
37 of the girls wore sweaters. After 18 girls who wore sweaters entered the tuckshop, the percentage of girls who wore sweaters increased to 60%. How many girls in the tuckshop did not wear sweaters?
|
Wore sweaters |
Did not wear sweaters |
Before |
3x1 = 3 u |
4x1 = 4 u |
Change |
+ 18 |
|
After |
3x2 = 6 u |
2x2 = 4 u |
60% =
60100 =
35The number of girls who did not wear sweaters remains unchanged. LCM of 4 and 2 is 4.
Number of girls who wore sweaters and left
= 6 u - 3 u
= 3 u
3 u = 18
1 u = 18 ÷ 3 = 6
Number of girls who did not wear sweaters
= 4 u
= 4 x 6
= 24
Answer(s): 24