exam Maths Puzzle Numerical Ability

what is the answer to this
4-2x/x2-12x+20

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exam Other Question

If n= 3p, for what value of p is n = p?

according to the answer provided on the back of the book, the answer is zero. However, i think the book is incorrect and the real answer is 1/3.

How do you solve this question?
we have a huge mountain, we have to determine how high the mountain is w/out having someone throwing a rope down from the peak no one can climb the mountain.
thanx