exam Maths Puzzle Numerical Ability

Division by inspection
Please help me solve the following problem:

27 a(cubed) + b(cubed) divided by 3a+b

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exam Other Question

I need help with these two matrice problems- solving it by the Gaussian elimination method:
problem 1.)2x + y - 3z =1
3x - y + 4z =6
x + 2y - z =9

Solve this equation.

t^2-t/6=35/6