SOLUTION: How many pounds of extra-lean hamburger that is 7% fat must be mixed with 30 pounds of hamburger that is 15% fat to obtain a mixture that is 10% fat. So far I have .07 + .15 I

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Question 404379: How many pounds of extra-lean hamburger that is 7% fat must be mixed with 30 pounds of hamburger that is 15% fat to obtain a mixture that is 10% fat.
So far I have .07 + .15
I am not sure what to do with the 30 pounds or the 10% fat.
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
x(7%) + 30(15%) = (30 + x)(10%)