exam Maths Puzzle Numerical Ability

Please help me with problem. It says to Simplify this expression. And im doing distributive property. (4-z)(-1)

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x^2+3x+2 x^2+5x+4
________ / _________

x^2+7x+12 x^2+5x+6 If the positions of the digits of a two-digit number are interchanged, the number obtained is smaller than the original number by 27. If the digits of the number are in the ratio of 1:2, what is the original number?