<PRE><B>Question 160067</B>
How many pounds of dog food A, containing 16% protein, needs to be blended with dog food B, containing 75% protein, to obtain 500 LBS of food with 7% protein? 

[first mixture] + [second mixture] = [total mixture] 

Let x = pounds 

[x(0.16)] + [x(0.75)] = (2x)(0.07) 

All you have to do is solve for x. Then multiply your value of x by 0.16 for dog food A and 0.75 for dog food B. 

Can you take it from here? 

If not, write back. 
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