exam Maths Puzzle Numerical Ability

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Solve the following system of Equations
6x-4y+5z=31
5x+2y+2z=13
x+y+z=2

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exam Other Question

The base of a triangle is one-third as long as its height. If the are of the triangle is 24 square meters, how long is its base? Preface: You are going to draw a random marble from a bag containing 5 red marbles, 8 green marbles and two blue marbles.

Question: What is the probability that you draw a red marble?
What are the odds that you draw a blue marble?