In a school field,
25 of the children wore vests. After 50 children who wore vests entered the school field, the percentage of children who wore vests increased to 60%. How many children in the school field did not wear vests?
| |
Wore vests |
Did not wear vests |
| Before |
2x2 =
4 u |
3x2 =
6 u |
| Change |
+ 50 |
|
| After |
3x3 =
9 u |
2x3 =
6 u |
60% =
60100 =
35The number of children who did not wear vests remains unchanged. LCM of 3 and 2 is 6.
Number of children who wore vests and left
= 9 u - 4 u
= 5 u
5 u = 50
1 u = 50 ÷ 5 = 10
Number of children who did not wear vests
= 6 u
= 6 x 10
= 60
Answer(s): 60
