exam Maths Puzzle Numerical Ability

How many quarts of pure antifreeze must be added to 6 quarts of a 40% antifreeze solution to obtain a 50% antifreeze solution?

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exam Other Question

Add the following polynomials:

(5b^3 - 8b + 2b^2) + (3b^2 - 7b^3 + 5b)
Write the equation x(x - 10) + 9 = 0 in quadratic form and then solve it by factoring