book Maths Puzzle Numerical Ability

When the reciprocal of 3 times a number is subtracted from the reciprocal of the #, the result is one-sixth. find the number.
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book Other Question
A triangle has sides 2x-5, 3x+1, and 4x+2. What is the polynomial that represents the perimter? Is it 24x-10? Divide.

15z^5 / 5z^2

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