In a parade square,
35 of the boys wore spectacles. After 12 boys who wore spectacles entered the parade square, the percentage of boys who wore spectacles increased to 75%. How many boys in the parade square did not wear spectacles?
|
Wore spectacles |
Did not wear spectacles |
Before |
3x1 = 3 u |
2x1 = 2 u |
Change |
+ 12 |
|
After |
3x2 = 6 u |
1x2 = 2 u |
75% =
75100 =
34The number of boys who did not wear spectacles remains unchanged. LCM of 2 and 1 is 2.
Number of boys who wore spectacles and left
= 6 u - 3 u
= 3 u
3 u = 12
1 u = 12 ÷ 3 = 4
Number of boys who did not wear spectacles
= 2 u
= 2 x 4
= 8
Answer(s): 8