Book Maths Puzzle Percentage

If I have 10 gallons of a 35% solution and I want to dilute it with water so that I have a 25% solution, how many gallons of water do I add?

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Book Other Question

If a^2=b then a is the _____ of b. For instance since 5 to the second power is 25 5 is the ________25. Fill in the blanks plz How would I start to graph the equation x^2 - 6x + y^2 - 4y +4 = 0??