Question 355138
Hi,
Let x be the total amount of the 4% milk.  The (15-x) would be the eamount of the 1% Milk
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question states**
.04x + .01(15-x) = .02*15gal
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simplify and solve
.04x - .01x + .01*15 = .02*15gal
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.03x = .01*15gal 
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x = .15/.03
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x = 5 gal
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check your answer
.04*5 + .01*10 = .2 + .1 = .3 = .02*15