



 
Hi Nathan, You have 40 gallons of a 10% solution of some compound so the amount of this compound in the solution is 0.10 × 40 = 4 gallons. Suppose you add x gallons of a 60% solution then the amount of the compound you are adding is 0.6 × x gallons. I put this information in a table
If 20% of (40 + x) gallons is (4 + 0.6 × x) gallons, what is x? Make sure you check your answer. Penny  


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