exam Maths Puzzle Numerical Ability

In equilateral triangle ANB, AM is a median. Use a two column proof to prove that AC is a median in equilateral triangle AME.

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exam Other Question

Find x:y:z, if 2x+y-5z = 0 and 3x-2y-4z=0
a)1:2:1 b)1:1:1 c)1:1:2 d)2:1:1 3x squared,...evaluate this expression for 3 diffrent values of x <------How can I solve that?