In a basketball court,
23 of the girls wore sweaters. After 85 girls who wore sweaters left the basketball court, the percentage of girls who wore sweaters decreased to 10%. How many girls in the basketball court did not wear sweaters?
| |
Wore sweaters |
Did not wear sweaters |
| Before |
2x9 =
18 u |
1x9 =
9 u |
| Change |
- 85 |
|
| After |
1x1 =
1 u |
9x1 =
9 u |
10% =
10100 =
110The number of girls who did not wear sweaters remains unchanged. LCM of 1 and 9 is 9.
Number of girls who wore sweaters and left
= 18 u - 1 u
= 17 u
17 u = 85
1 u = 85 ÷ 17 = 5
Number of girls who did not wear sweaters
= 9 u
= 9 x 5
= 45
Answer(s): 45
