In a tuckshop,
12 of the students wore ties. After 18 students who wore ties left the tuckshop, the percentage of students who wore ties decreased to 20%. How many students in the tuckshop did not wear ties?
|
Wore ties |
Did not wear ties |
Before |
1x4 = 4 u |
1x4 = 4 u |
Change |
- 18 |
|
After |
1x1 = 1 u |
4x1 = 4 u |
20% =
20100 =
15The number of students who did not wear ties remains unchanged. LCM of 1 and 4 is 4.
Number of students who wore ties and left
= 4 u - 1 u
= 3 u
3 u = 18
1 u = 18 ÷ 3 = 6
Number of students who did not wear ties
= 4 u
= 4 x 6
= 24
Answer(s): 24