In a tuckshop,
23 of the girls wore sweaters. After 30 girls who wore sweaters left the tuckshop, the percentage of girls who wore sweaters decreased to 25%. How many girls in the tuckshop did not wear sweaters?
| |
Wore sweaters |
Did not wear sweaters |
| Before |
2x3 =
6 u |
1x3 =
3 u |
| Change |
- 30 |
|
| After |
1x1 =
1 u |
3x1 =
3 u |
25% =
25100 =
14The number of girls who did not wear sweaters remains unchanged. LCM of 1 and 3 is 3.
Number of girls who wore sweaters and left
= 6 u - 1 u
= 5 u
5 u = 30
1 u = 30 ÷ 5 = 6
Number of girls who did not wear sweaters
= 3 u
= 3 x 6
= 18
Answer(s): 18
