12/30 * 100 would give you the answer.
Therefore 40% is the answer.
The reason to this is because you need 12/30 of percent (100)
Answer : The volume of box B is 
Step-by-step explanation :
Given :
Volume of box A = 512 cubic meter
Let us assumed that the box A and box B are cubes and the dimensions of cube are same i.e, 'a'.
Volume of box A = V = 
As per question,
When dimensions of box A divided by 2 then the volume of box B will be:
Volume of box A = V' = 
As the box B is similar to box A. So, the volume of box B will be:
Volume of box B = V' = 


Therefore, the volume of box B is 
Answer:
60%
Step-by-step explanation:
6 is 40% of 15, therefore meaning the remaining 60% of her class are boys