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how many pounds of meal

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Since we wish the mixture to cost 1.40 per pound be part grain (x) and part meal (1-x) we see that
1.40=1.6*x+.8*(1-x)
1.40=.8+.8x
.6=.8x
x=.75. So then 75% of the mixture is grain and 25% is meal. Since there is 1/3 as much meal as there is grain (25%/75%=1/3) we need 450/3=150lbs of meal.