book Maths Puzzle Numerical Ability

A pharmacists needs to obtain a 70% alcohol solution. How many ounces of a 30% alcohol solution must be mixed with 40 ounces of an 80% alcohol solution to obtain a 70% alcohol solution?

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book Other Question
3x^2=11x+4
Solve by using quadratic formula A purse contains $8.35 in quarters and dimes. There are 4 more quarters than dimes. Find the number of quarters and dimes.