exam Maths Puzzle Numerical Ability

how much pure antifreeze must be added to 12L of a 40% solution of antifreeze to obtain a 60% solution?

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exam Other Question

Which sets of ordered pairs (x, y) define y as a function of x?
I = {(4, 7), (3, 7), (2, 5), (8, -8)}

II = {(5, 1), (-3, 4), (-3, 2)} Describe the differences in the graphs of |X|>A and |X| less than A, where A is a positive real number