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Step-by-step explanation:

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Now you have

(.15)0.5 lb peanuts = 0.075 lb peanuts
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for every pound of 75% mixed nuts you add, you get .75 lb peanuts, how many pounds, x, do you need to add to get the ratio 50 to 100?

0.075 lb peanuts + 0.75x lb peanuts = 50 
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cross multiply

(0.075 + .75x) 100 = (0.5 + x) 50
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