In a basketball court,
38 of the pupils wore spectacles. After 27 pupils who wore spectacles entered the basketball court, the percentage of pupils who wore spectacles increased to 60%. How many pupils in the basketball court did not wear spectacles?
| |
Wore spectacles |
Did not wear spectacles |
| Before |
3x2 =
6 u |
5x2 =
10 u |
| Change |
+ 27 |
|
| After |
3x5 =
15 u |
2x5 =
10 u |
60% =
60100 =
35The number of pupils who did not wear spectacles remains unchanged. LCM of 5 and 2 is 10.
Number of pupils who wore spectacles and left
= 15 u - 6 u
= 9 u
9 u = 27
1 u = 27 ÷ 9 = 3
Number of pupils who did not wear spectacles
= 10 u
= 10 x 3
= 30
Answer(s): 30
