exam Maths Puzzle Numerical Ability

Find the polynominal f(x) of degree three that has zeros at 1,2 and 4 such that f(0)=-16.

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exam Other Question

How do you solve x/5x+25 - 5/x^2+5x x punds of candy valued at $3.50 per pound is mixed with y pounds of candy valued at $4.30 per pound to produce 10 pounds of a mixture selling for $4 per pound. Find x and y, the number of pounds of each type.