Question

how many quarts of 2% and 7% milk is needed to make 40 quarts of 5% milk

Answer 1

Hi Welcome to Openstudy,
This is how you start this problem:


Let x be the # of quarts at 2% milk
Let y be the # of quarts at 7% milk

You need 40 quarts of 5% milk, which is 0.05x40 = 2.0

Set up your equations like this:
0.02 x + 0.07y = 2.0 --> equation1
x + y = 40 --> equation 2

Now solve the values of x and y using substitution method or elimination method.
If you need more help, please don't hesitate to ask :)