exam Maths Puzzle Numerical Ability

When the reciprocal of three times a number is subtracted from the reciprocal of the number, the result is 1/6. Find the number.

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exam Other Question

Explain how to construct a square using a compass and a streight-edge. Clearly define each step.
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Can someone please help me with this? I don't know how to do it. whats the polynomials factor of x^2-7x+6 ?