In a hall,
19 of the students wore sweaters. After 159 students who wore sweaters entered the hall, the percentage of students who wore sweaters increased to 70%. How many students in the hall did not wear sweaters?
| |
Wore sweaters |
Did not wear sweaters |
| Before |
1x3 =
3 u |
8x3 =
24 u |
| Change |
+ 159 |
|
| After |
7x8 =
56 u |
3x8 =
24 u |
70% =
70100 =
710The number of students who did not wear sweaters remains unchanged. LCM of 8 and 3 is 24.
Number of students who wore sweaters and left
= 56 u - 3 u
= 53 u
53 u = 159
1 u = 159 ÷ 53 = 3
Number of students who did not wear sweaters
= 24 u
= 24 x 3
= 72
Answer(s): 72
