In a basketball court,
14 of the boys wore spectacles. After 70 boys who wore spectacles entered the basketball court, the percentage of boys who wore spectacles increased to 60%. How many boys in the basketball court did not wear spectacles?
| |
Wore spectacles |
Did not wear spectacles |
| Before |
1x2 =
2 u |
3x2 =
6 u |
| Change |
+ 70 |
|
| After |
3x3 =
9 u |
2x3 =
6 u |
60% =
60100 =
35The number of boys who did not wear spectacles remains unchanged. LCM of 3 and 2 is 6.
Number of boys who wore spectacles and left
= 9 u - 2 u
= 7 u
7 u = 70
1 u = 70 ÷ 7 = 10
Number of boys who did not wear spectacles
= 6 u
= 6 x 10
= 60
Answer(s): 60
