In a parade square,
79 of the girls wore ties. After 472 girls who wore ties left the parade square, the percentage of girls who wore ties decreased to 45%. How many girls in the parade square did not wear ties?
| |
Wore ties |
Did not wear ties |
| Before |
7x11 =
77 u |
2x11 =
22 u |
| Change |
- 472 |
|
| After |
9x2 =
18 u |
11x2 =
22 u |
45% =
45100 =
920The number of girls who did not wear ties remains unchanged. LCM of 2 and 11 is 22.
Number of girls who wore ties and left
= 77 u - 18 u
= 59 u
59 u = 472
1 u = 472 ÷ 59 = 8
Number of girls who did not wear ties
= 22 u
= 22 x 8
= 176
Answer(s): 176
