exam Maths Puzzle Numerical Ability

How many gallons of an 80% alcohol solution must be mixed with 30 gallons of a 22% solution to obtain a solution that is 70% alcohol?

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exam Other Question

I need to find the vertex of the parabola

f(x)=3x2-18x+32 Find the difference of the polynomials below. Use the caret ( ^ ) to enter any exponents; for example, write x2 as x^2. Write your answer in descending order(x3 + 2x2 + 4x + 7) - (2x3 - 1.5x2 + 4x + 4)