exam Maths Puzzle Numerical Ability

20) A small firm produces both AM and AM/FM car radios. The AM radios take 15 hours to produce, and the AM/FM radios take 20 hours. The number of production hours is limited to 3

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factor x^3+2x^2-5x-6 by using synthetic division. Sally walks 3 miles north of her farm, turns west and walks 4 miles. How far must she walk if she can walk directly back to her farm?