In a school field,
710 of the girls wore ties. After 48 girls who wore ties left the school field, the percentage of girls who wore ties decreased to 50%. How many girls in the school field did not wear ties?
|
Wore ties |
Did not wear ties |
Before |
7x1 = 7 u |
3x1 = 3 u |
Change |
- 48 |
|
After |
1x3 = 3 u |
1x3 = 3 u |
50% =
50100 =
12The number of girls who did not wear ties remains unchanged. LCM of 3 and 1 is 3.
Number of girls who wore ties and left
= 7 u - 3 u
= 4 u
4 u = 48
1 u = 48 ÷ 4 = 12
Number of girls who did not wear ties
= 3 u
= 3 x 12
= 36
Answer(s): 36