In a tuckshop,
79 of the girls wore scarves. After 88 girls who wore scarves entered the tuckshop, the percentage of girls who wore scarves increased to 90%. How many girls in the tuckshop did not wear scarves?
| |
Wore scarves |
Did not wear scarves |
| Before |
7x1 =
7 u |
2x1 =
2 u |
| Change |
+ 88 |
|
| After |
9x2 =
18 u |
1x2 =
2 u |
90% =
90100 =
910The number of girls who did not wear scarves remains unchanged. LCM of 2 and 1 is 2.
Number of girls who wore scarves and left
= 18 u - 7 u
= 11 u
11 u = 88
1 u = 88 ÷ 11 = 8
Number of girls who did not wear scarves
= 2 u
= 2 x 8
= 16
Answer(s): 16
