exam Maths Puzzle Numerical Ability

18/48 = 12/n

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exam Other Question

I am having a problem working this equation: 1/2 - 3m /4+7 + 4m - 9m /28.
I added 3m to both sides and come up with 1/2 / 11 = -5m / 28. Am I on the right track? Are (x - 1) and (x + 4) factors of P(x) = 2x3 + 5x2 - 13x + 4

thank you in advance