In a school field,
16 of the girls wore ties. After 52 girls who wore ties entered the school field, the percentage of girls who wore ties increased to 60%. How many girls in the school field did not wear ties?
| |
Wore ties |
Did not wear ties |
| Before |
1x2 =
2 u |
5x2 =
10 u |
| Change |
+ 52 |
|
| After |
3x5 =
15 u |
2x5 =
10 u |
60% =
60100 =
35The number of girls who did not wear ties remains unchanged. LCM of 5 and 2 is 10.
Number of girls who wore ties and left
= 15 u - 2 u
= 13 u
13 u = 52
1 u = 52 ÷ 13 = 4
Number of girls who did not wear ties
= 10 u
= 10 x 4
= 40
Answer(s): 40
