<PRE><B>Question 1053212</B>
Same problem, different numbers.
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 A dairy needs 235 gallons of milk containing 5% butterfat. How many gallons each of milk containing 7% butterfat and milk containing 2% butterfat must be used to obtain the desired 235 gallons?  
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 Let n be the amount of 7% butterfat milk. Then:
 .07n+.02(235-n)=.05(235)
 7n+2(235-n)=5(235)
 5n+470=1175
 5n=705
 n=141
 The dairy needs 141 gallons of 7% butterfat milk, and 94 gallons of 2% butterfat milk for its desired mixture.</PRE>