In a parade square,
57 of the boys wore scarves. After 344 boys who wore scarves left the parade square, the percentage of boys who wore scarves decreased to 10%. How many boys in the parade square did not wear scarves?
| |
Wore scarves |
Did not wear scarves |
| Before |
5x9 =
45 u |
2x9 =
18 u |
| Change |
- 344 |
|
| After |
1x2 =
2 u |
9x2 =
18 u |
10% =
10100 =
110The number of boys who did not wear scarves remains unchanged. LCM of 2 and 9 is 18.
Number of boys who wore scarves and left
= 45 u - 2 u
= 43 u
43 u = 344
1 u = 344 ÷ 43 = 8
Number of boys who did not wear scarves
= 18 u
= 18 x 8
= 144
Answer(s): 144
