In a hall,
16 of the students wore spectacles. After 352 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 |
5x3 = 15 u |
Change |
+ 352 |
|
After |
7x5 = 35 u |
3x5 = 15 u |
70% =
70100 =
710The number of students who did not wear spectacles remains unchanged. LCM of 5 and 3 is 15.
Number of students who wore spectacles and left
= 35 u - 3 u
= 32 u
32 u = 352
1 u = 352 ÷ 32 = 11
Number of students who did not wear spectacles
= 15 u
= 15 x 11
= 165
Answer(s): 165