Nathan mixed x quarts of milk containing 2% fat with y quarts of milk containing 4% fat. the total amount of the mixture was 9 quarts, and it contained a total of 0.24 quart of fat. this situation is represented by the system of equations shown below.

x + y = 9
0.02x + 0.04y = 0.24

what statement is true?

a)nathan used twice as much 2% milk as 4% milk.

b)nathan used twice as much 4% milk as 2% milk.

c)nathan used 2 quarts more 2% milk than 4% milk.

d)nathan used 2 quarts more 4% milk than 2% milk.

i am just checking to make sure that i'm correct. for this i chose answer a. for the in advance.