In a parade square,
79 of the boys wore sweaters. After 387 boys who wore sweaters left the parade square, the percentage of boys who wore sweaters decreased to 30%. How many boys in the parade square did not wear sweaters?
|
Wore sweaters |
Did not wear sweaters |
Before |
7x7 = 49 u |
2x7 = 14 u |
Change |
- 387 |
|
After |
3x2 = 6 u |
7x2 = 14 u |
30% =
30100 =
310The number of boys who did not wear sweaters remains unchanged. LCM of 2 and 7 is 14.
Number of boys who wore sweaters and left
= 49 u - 6 u
= 43 u
43 u = 387
1 u = 387 ÷ 43 = 9
Number of boys who did not wear sweaters
= 14 u
= 14 x 9
= 126
Answer(s): 126