Book Maths Puzzle Percentage

How many gallons of a 70% acid solution must be mixed with 30 gallons of a 16% solution to obtain a solution that is 60% acid?

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Book Other Question

The sum of three consecutive positive integers is 246. Find the largest integer. I want to know not only the answer to the question but also how to solve it. If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for both of them to paint the house together?