Had this on a practice test and couldn't find an explanation.
During the test I got a bit flummoxed and just had written out like (x+2y+3z)/3=1.5 and then ran short on time and saw like terms in answer and selected C (2y+3z) but that is not the answer and if I was paying attention I could see that E and C are the same.
Now, upon review, I still don't see how to get to the answer that was provided *in white*y+3z. I tried to put all terms in terms of z, so x=1/3z y=2/3z then got 2z/3=3/2 and z=9/4 but that didn't get me anywhere. Help appreciated.
Three grades of milk are 1%, 2%, and 3% fat by volume. If x gallons of the 1% grade, y gallons of the 2% grade, and z gallons of the 3% grade are mixed to give x+y+z gallons a 1.5% grade, what is x in terms of y and z?
y+3z
(y+z)/4
2y+3z
3y+z
3y+4.5z
During the test I got a bit flummoxed and just had written out like (x+2y+3z)/3=1.5 and then ran short on time and saw like terms in answer and selected C (2y+3z) but that is not the answer and if I was paying attention I could see that E and C are the same.
Now, upon review, I still don't see how to get to the answer that was provided *in white*y+3z. I tried to put all terms in terms of z, so x=1/3z y=2/3z then got 2z/3=3/2 and z=9/4 but that didn't get me anywhere. Help appreciated.
!!
