In a canteen,
29 of the students wore sweaters. After 344 students who wore sweaters entered the canteen, the percentage of students who wore sweaters increased to 70%. How many students in the canteen did not wear sweaters?
| |
Wore sweaters |
Did not wear sweaters |
| Before |
2x3 =
6 u |
7x3 =
21 u |
| Change |
+ 344 |
|
| After |
7x7 =
49 u |
3x7 =
21 u |
70% =
70100 =
710The number of students who did not wear sweaters remains unchanged. LCM of 7 and 3 is 21.
Number of students who wore sweaters and left
= 49 u - 6 u
= 43 u
43 u = 344
1 u = 344 ÷ 43 = 8
Number of students who did not wear sweaters
= 21 u
= 21 x 8
= 168
Answer(s): 168
