In a school field,
25 of the girls wore vests. After 15 girls who wore vests entered the school field, the percentage of girls who wore vests increased to 60%. How many girls in the school field did not wear vests?
|
Wore vests |
Did not wear vests |
Before |
2x2 = 4 u |
3x2 = 6 u |
Change |
+ 15 |
|
After |
3x3 = 9 u |
2x3 = 6 u |
60% =
60100 =
35The number of girls who did not wear vests remains unchanged. LCM of 3 and 2 is 6.
Number of girls who wore vests and left
= 9 u - 4 u
= 5 u
5 u = 15
1 u = 15 ÷ 5 = 3
Number of girls who did not wear vests
= 6 u
= 6 x 3
= 18
Answer(s): 18