book Maths Puzzle Numerical Ability

factor 125x^3 - y^3

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book Other Question

Tweeledum says "the sum of your weight and twice mine is 361 pounds." Tweedledee says "Contrariwiwse, the sum of your weight and twice mine is 362 pounds." if they are both correct, how much do Tweedledum and Tweedledee weight together? The instructions say divide. The problem is 4 / 7+i. I have come up with 7/12 + 1/12i. Is the the correct solution? THanks in advance.