book Maths Puzzle Numerical Ability

please help me
Reduce the fraction 6x/12x. Would this be 1/2?

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book Other Question

If you have the problem of one simplified and one non simplified equation, do you simplify the non simplified one: My problem is:
3sqareroot2 (squareroot8 - 2squareroot3)
My ans If a 17-ft. ladder is leaning against a building. The base of the ladder is 7 feet from the base of the building. How high up the side of the building is the top of the ladder?