In a canteen,
89 of the girls wore sweaters. After 65 girls who wore sweaters left the canteen, the percentage of girls who wore sweaters decreased to 60%. How many girls in the canteen did not wear sweaters?
| |
Wore sweaters |
Did not wear sweaters |
| Before |
8x2 =
16 u |
1x2 =
2 u |
| Change |
- 65 |
|
| After |
3x1 =
3 u |
2x1 =
2 u |
60% =
60100 =
35The number of girls who did not wear sweaters remains unchanged. LCM of 1 and 2 is 2.
Number of girls who wore sweaters and left
= 16 u - 3 u
= 13 u
13 u = 65
1 u = 65 ÷ 13 = 5
Number of girls who did not wear sweaters
= 2 u
= 2 x 5
= 10
Answer(s): 10
