In a basketball court,
47 of the girls wore caps. After 77 girls who wore caps left the basketball court, the percentage of girls who wore caps decreased to 10%. How many girls in the basketball court did not wear caps?
|
Wore caps |
Did not wear caps |
Before |
4x3 = 12 u |
3x3 = 9 u |
Change |
- 77 |
|
After |
1x1 = 1 u |
9x1 = 9 u |
10% =
10100 =
110The number of girls who did not wear caps remains unchanged. LCM of 3 and 9 is 9.
Number of girls who wore caps and left
= 12 u - 1 u
= 11 u
11 u = 77
1 u = 77 ÷ 11 = 7
Number of girls who did not wear caps
= 9 u
= 9 x 7
= 63
Answer(s): 63