In a tuckshop,
49 of the girls wore caps. After 123 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 |
4x1 =
4 u |
5x1 =
5 u |
| Change |
+ 123 |
|
| After |
9x5 =
45 u |
1x5 =
5 u |
90% =
90100 =
910The number of girls who did not wear caps remains unchanged. LCM of 5 and 1 is 5.
Number of girls who wore caps and left
= 45 u - 4 u
= 41 u
41 u = 123
1 u = 123 ÷ 41 = 3
Number of girls who did not wear caps
= 5 u
= 5 x 3
= 15
Answer(s): 15
