In a parade square,
78 of the boys wore sweaters. After 744 boys who wore sweaters left the parade square, the percentage of boys who wore sweaters decreased to 10%. How many boys in the parade square did not wear sweaters?
|
Wore sweaters |
Did not wear sweaters |
Before |
7x9 = 63 u |
1x9 = 9 u |
Change |
- 744 |
|
After |
1x1 = 1 u |
9x1 = 9 u |
10% =
10100 =
110The number of boys who did not wear sweaters remains unchanged. LCM of 1 and 9 is 9.
Number of boys who wore sweaters and left
= 63 u - 1 u
= 62 u
62 u = 744
1 u = 744 ÷ 62 = 12
Number of boys who did not wear sweaters
= 9 u
= 9 x 12
= 108
Answer(s): 108