exam Maths Puzzle Numerical Ability

I need to solve the inequality, but I am getting confused with the fractionin the problem.

2/3(12-x)>4
thank you

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exam Other Question

Assuming the truth of the theorem that states that √n is irrational whenever n is a positive integer that is not a perfect square, prove that √2 + √3 is irrational. the similtanious equation graph for y=x+4 and y=2x+2