In a tuckshop,
34 of the girls wore ties. After 40 girls who wore ties left the tuckshop, the percentage of girls who wore ties decreased to 25%. How many girls in the tuckshop did not wear ties?
| |
Wore ties |
Did not wear ties |
| Before |
3x3 =
9 u |
1x3 =
3 u |
| Change |
- 40 |
|
| After |
1x1 =
1 u |
3x1 =
3 u |
25% =
25100 =
14The number of girls who did not wear ties remains unchanged. LCM of 1 and 3 is 3.
Number of girls who wore ties and left
= 9 u - 1 u
= 8 u
8 u = 40
1 u = 40 ÷ 8 = 5
Number of girls who did not wear ties
= 3 u
= 3 x 5
= 15
Answer(s): 15
