In a canteen,
56 of the girls wore vests. After 49 girls who wore vests left the canteen, the percentage of girls who wore vests decreased to 60%. How many girls in the canteen did not wear vests?
| |
Wore vests |
Did not wear vests |
| Before |
5x2 =
10 u |
1x2 =
2 u |
| Change |
- 49 |
|
| After |
3x1 =
3 u |
2x1 =
2 u |
60% =
60100 =
35The number of girls who did not wear vests remains unchanged. LCM of 1 and 2 is 2.
Number of girls who wore vests and left
= 10 u - 3 u
= 7 u
7 u = 49
1 u = 49 ÷ 7 = 7
Number of girls who did not wear vests
= 2 u
= 2 x 7
= 14
Answer(s): 14
