In a hall,
910 of the girls wore ties. After 45 girls who wore ties left the hall, the percentage of girls who wore ties decreased to 60%. How many girls in the hall did not wear ties?
| |
Wore ties |
Did not wear ties |
| Before |
9x2 =
18 u |
1x2 =
2 u |
| Change |
- 45 |
|
| After |
3x1 =
3 u |
2x1 =
2 u |
60% =
60100 =
35The number of girls who did not wear ties remains unchanged. LCM of 1 and 2 is 2.
Number of girls who wore ties and left
= 18 u - 3 u
= 15 u
15 u = 45
1 u = 45 ÷ 15 = 3
Number of girls who did not wear ties
= 2 u
= 2 x 3
= 6
Answer(s): 6
