book Maths Puzzle Numerical Ability

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——————— + ——————— = —————————
t - 1 t + 2 t2</sup> + t-2</sup>
Please help me figure out this problem. I think it may have no solution.</PRE>

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What is the least common multiple of p and s if the greatest common factor of p and s is 9? can you factor x squared - x - 20 ? Thank you. Amanda