In a hall,
17 of the girls wore caps. After 69 girls who wore caps entered the hall, the percentage of girls who wore caps increased to 80%. How many girls in the hall did not wear caps?
|
Wore caps |
Did not wear caps |
Before |
1x1 = 1 u |
6x1 = 6 u |
Change |
+ 69 |
|
After |
4x6 = 24 u |
1x6 = 6 u |
80% =
80100 =
45The number of girls who did not wear caps remains unchanged. LCM of 6 and 1 is 6.
Number of girls who wore caps and left
= 24 u - 1 u
= 23 u
23 u = 69
1 u = 69 ÷ 23 = 3
Number of girls who did not wear caps
= 6 u
= 6 x 3
= 18
Answer(s): 18