exam Maths Puzzle Numerical Ability

Does anyone know how to do this problem?

I need to find the constant of variation k

M varies directly with N; M = 144 when N= 8

Thanks,
sher

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exam Other Question

Simplify and evaluate:
(4^2x^3y^(-2)z^(-3)/x^(-5)y^8z^(-9))2
(6x+2)^1/3 - 4 = 3