In a tuckshop,
18 of the girls wore caps. After 682 girls who wore caps entered the tuckshop, the percentage of girls who wore caps increased to 90%. How many girls in the tuckshop did not wear caps?
|
Wore caps |
Did not wear caps |
Before |
1x1 = 1 u |
7x1 = 7 u |
Change |
+ 682 |
|
After |
9x7 = 63 u |
1x7 = 7 u |
90% =
90100 =
910The number of girls who did not wear caps remains unchanged. LCM of 7 and 1 is 7.
Number of girls who wore caps and left
= 63 u - 1 u
= 62 u
62 u = 682
1 u = 682 ÷ 62 = 11
Number of girls who did not wear caps
= 7 u
= 7 x 11
= 77
Answer(s): 77