In a hall,
15 of the students wore spectacles. After 100 students who wore spectacles entered the hall, the percentage of students who wore spectacles increased to 70%. How many students in the hall did not wear spectacles?
| |
Wore spectacles |
Did not wear spectacles |
| Before |
1x3 =
3 u |
4x3 =
12 u |
| Change |
+ 100 |
|
| After |
7x4 =
28 u |
3x4 =
12 u |
70% =
70100 =
710The number of students who did not wear spectacles remains unchanged. LCM of 4 and 3 is 12.
Number of students who wore spectacles and left
= 28 u - 3 u
= 25 u
25 u = 100
1 u = 100 ÷ 25 = 4
Number of students who did not wear spectacles
= 12 u
= 12 x 4
= 48
Answer(s): 48
