In a basketball court,
14 of the girls wore caps. After 130 girls who wore caps entered the basketball court, the percentage of girls who wore caps increased to 90%. How many girls in the basketball court did not wear caps?
| |
Wore caps |
Did not wear caps |
| Before |
1x1 =
1 u |
3x1 =
3 u |
| Change |
+ 130 |
|
| After |
9x3 =
27 u |
1x3 =
3 u |
90% =
90100 =
910The number of girls who did not wear caps remains unchanged. LCM of 3 and 1 is 3.
Number of girls who wore caps and left
= 27 u - 1 u
= 26 u
26 u = 130
1 u = 130 ÷ 26 = 5
Number of girls who did not wear caps
= 3 u
= 3 x 5
= 15
Answer(s): 15
