book Maths Puzzle Numerical Ability

Restar a-b de b-a
x-y de 2x+3y
-5a+b de -7a+5

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book Other Question

solve beware of extraneois solutions 10/(x(x-2)) + 4/x = 5/(x-2) A box contains 2 blue card numbered 1 thought 2, and three green cards numbered 1 through 3. List the sample space of picking a blue card followed by a green card.