In a basketball court,
59 of the boys wore sweaters. After 253 boys who wore sweaters left the basketball court, the percentage of boys who wore sweaters decreased to 30%. How many boys in the basketball court did not wear sweaters?
| |
Wore sweaters |
Did not wear sweaters |
| Before |
5x7 =
35 u |
4x7 =
28 u |
| Change |
- 253 |
|
| After |
3x4 =
12 u |
7x4 =
28 u |
30% =
30100 =
310The number of boys who did not wear sweaters remains unchanged. LCM of 4 and 7 is 28.
Number of boys who wore sweaters and left
= 35 u - 12 u
= 23 u
23 u = 253
1 u = 253 ÷ 23 = 11
Number of boys who did not wear sweaters
= 28 u
= 28 x 11
= 308
Answer(s): 308
