A landscaping company is preparing a new soil mixture using 300 pounds of soil priced at $1.20 per pound and an unknown quantity of soil that costs $1.80 per pound. How many pounds of the $1.80 per pound soil must be added to achieve a final blend price of $1.50 per pound?

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This was a nice confidence booster. Alligation method makes it super fast: the ratio of amounts is (1.80-1.50):(1.50-1.20) = 0.30:0.30 = 1:1, so you need equal amounts. Since you have 300 lbs of the cheaper, you need 300 lbs of the expensive one. Answer E.