In a canteen,
710 of the boys wore sweaters. After 35 boys who wore sweaters left the canteen, the percentage of boys who wore sweaters decreased to 60%. How many boys in the canteen did not wear sweaters?
| |
Wore sweaters |
Did not wear sweaters |
| Before |
7x2 =
14 u |
3x2 =
6 u |
| Change |
- 35 |
|
| After |
3x3 =
9 u |
2x3 =
6 u |
60% =
60100 =
35The number of boys who did not wear sweaters remains unchanged. LCM of 3 and 2 is 6.
Number of boys who wore sweaters and left
= 14 u - 9 u
= 5 u
5 u = 35
1 u = 35 ÷ 5 = 7
Number of boys who did not wear sweaters
= 6 u
= 6 x 7
= 42
Answer(s): 42
