Mixture Problems?? Please help with any of these i dont understand!! 
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A dealer wishes to produce 300 gallons of oil worth 40 cents a quart. He has oil worth 36 cents a quart and oil worth 52 cents a quart. How many quarts of each should he mix?
A grocer bought some walnuts for 45 cents per pound and some pecans for 60 cents per pound. If he mixed them for a 90-pound mixture worth 55 cents a pound, how many pounds of walnuts did he use?
An alloy of tin and copper contains 16% tin. How much tin (to the nearest tenth) must be added to make 820 pounds of alloy that is 18% tin?
i want to learn how to do these! i hate word problems!
1. x = oil of 36 cents a quart
300- x= oil of 52 cents quart
x(36) +(300-x)(52) = 300(40)
36x +15600 - 52 x = 12000
-16x = -3600
Answer x = 225 quart.of 36 cents
Answer 300-225 = 75 quart of 52 cents
2. similarly
x(45) +(90 - x)60 = 90(55)
45x -60 x +5400 =4950
15 x = 450
Answer x = 30 pounds of 45 cents
Answer 90-30 = 60 pounds of 60 cents.
3. similarly
(800- x)(0.16) +(x)(1) = 820(0.18)
multiply by 100
12800 - 16 x +100x = 14760
84 x =1960
Answer x = 23.3 pound
Knowledge
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