In a tuckshop,
49 of the girls wore vests. After 143 girls who wore vests left the tuckshop, the percentage of girls who wore vests decreased to 30%. How many girls in the tuckshop did not wear vests?
|
Wore vests |
Did not wear vests |
Before |
4x7 = 28 u |
5x7 = 35 u |
Change |
- 143 |
|
After |
3x5 = 15 u |
7x5 = 35 u |
30% =
30100 =
310The number of girls who did not wear vests remains unchanged. LCM of 5 and 7 is 35.
Number of girls who wore vests and left
= 28 u - 15 u
= 13 u
13 u = 143
1 u = 143 ÷ 13 = 11
Number of girls who did not wear vests
= 35 u
= 35 x 11
= 385
Answer(s): 385