In a basketball court,
58 of the pupils wore spectacles. After 12 pupils who wore spectacles entered the basketball court, the percentage of pupils who wore spectacles increased to 75%. How many pupils in the basketball court did not wear spectacles?
| |
Wore spectacles |
Did not wear spectacles |
| Before |
5x1 =
5 u |
3x1 =
3 u |
| Change |
+ 12 |
|
| After |
3x3 =
9 u |
1x3 =
3 u |
75% =
75100 =
34The number of pupils who did not wear spectacles remains unchanged. LCM of 3 and 1 is 3.
Number of pupils who wore spectacles and left
= 9 u - 5 u
= 4 u
4 u = 12
1 u = 12 ÷ 4 = 3
Number of pupils who did not wear spectacles
= 3 u
= 3 x 3
= 9
Answer(s): 9
