In a school field,
910 of the girls wore vests. After 52 girls who wore vests left the school field, the percentage of girls who wore vests decreased to 25%. How many girls in the school field did not wear vests?
| |
Wore vests |
Did not wear vests |
| Before |
9x3 =
27 u |
1x3 =
3 u |
| Change |
- 52 |
|
| After |
1x1 =
1 u |
3x1 =
3 u |
25% =
25100 =
14The number of girls who did not wear vests remains unchanged. LCM of 1 and 3 is 3.
Number of girls who wore vests and left
= 27 u - 1 u
= 26 u
26 u = 52
1 u = 52 ÷ 26 = 2
Number of girls who did not wear vests
= 3 u
= 3 x 2
= 6
Answer(s): 6
