In a tuckshop,
45 of the students wore glasses. After 50 students who wore glasses left the tuckshop, the percentage of students who wore glasses decreased to 30%. How many students in the tuckshop did not wear glasses?
| |
Wore glasses |
Did not wear glasses |
| Before |
4x7 =
28 u |
1x7 =
7 u |
| Change |
- 50 |
|
| After |
3x1 =
3 u |
7x1 =
7 u |
30% =
30100 =
310The number of students who did not wear glasses remains unchanged. LCM of 1 and 7 is 7.
Number of students who wore glasses and left
= 28 u - 3 u
= 25 u
25 u = 50
1 u = 50 ÷ 25 = 2
Number of students who did not wear glasses
= 7 u
= 7 x 2
= 14
Answer(s): 14
