In a hall,
34 of the girls wore vests. After 36 girls who wore vests left the hall, the percentage of girls who wore vests decreased to 30%. How many girls in the hall did not wear vests?
|
Wore vests |
Did not wear vests |
Before |
3x7 = 21 u |
1x7 = 7 u |
Change |
- 36 |
|
After |
3x1 = 3 u |
7x1 = 7 u |
30% =
30100 =
310The number of girls who did not wear vests remains unchanged. LCM of 1 and 7 is 7.
Number of girls who wore vests and left
= 21 u - 3 u
= 18 u
18 u = 36
1 u = 36 ÷ 18 = 2
Number of girls who did not wear vests
= 7 u
= 7 x 2
= 14
Answer(s): 14