SOLUTION: A dairy man wishes to prepare cream containing 5% butterfat. How much cream of 25% butterfat must be added to 50 kilos of cream approximately containing 4% butterfat?

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Question 825965: A dairy man wishes to prepare cream containing 5% butterfat. How much cream of 25% butterfat must be added to 50 kilos of cream approximately containing 4% butterfat?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
One quantity known, the other quantity unknown, call it z.

(fat)/(blend)=5%

%2825z%2B4%2A50%29%2F%28z%2B50%29=5
Solve for z.