In a basketball court,
58 of the boys wore caps. After 51 boys who wore caps left the basketball court, the percentage of boys who wore caps decreased to 20%. How many boys in the basketball court did not wear caps?
|
Wore caps |
Did not wear caps |
Before |
5x4 = 20 u |
3x4 = 12 u |
Change |
- 51 |
|
After |
1x3 = 3 u |
4x3 = 12 u |
20% =
20100 =
15The number of boys who did not wear caps remains unchanged. LCM of 3 and 4 is 12.
Number of boys who wore caps and left
= 20 u - 3 u
= 17 u
17 u = 51
1 u = 51 ÷ 17 = 3
Number of boys who did not wear caps
= 12 u
= 12 x 3
= 36
Answer(s): 36