In a basketball court,
14 of the boys wore glasses. After 312 boys who wore glasses entered the basketball court, the percentage of boys who wore glasses increased to 90%. How many boys in the basketball court did not wear glasses?
| |
Wore glasses |
Did not wear glasses |
| Before |
1x1 =
1 u |
3x1 =
3 u |
| Change |
+ 312 |
|
| After |
9x3 =
27 u |
1x3 =
3 u |
90% =
90100 =
910The number of boys who did not wear glasses remains unchanged. LCM of 3 and 1 is 3.
Number of boys who wore glasses and left
= 27 u - 1 u
= 26 u
26 u = 312
1 u = 312 ÷ 26 = 12
Number of boys who did not wear glasses
= 3 u
= 3 x 12
= 36
Answer(s): 36
