book Maths Puzzle Numerical Ability

A scientist has to make 800ml of 61% sulfuric acid solution. He has available a one liter bottle of 40% sulfuric acid solution and a one liter bottle of 75% sulfuric acid solution.

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f(4,-18) In four rounds of a recent golf tournament, Julie shot 3 under par, 2 over par, 4 under par, and 1 under par. What was her score for the tournament?