exam Maths Puzzle Numerical Ability

Solve: 9 – (3x – 2) = 21

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exam Other Question

I need some help with simplifying the following:

1/2y^2 + 6/8y^3

I come up with the following answer:

1/2y^2 + 3/256

Is this correct?
find three consecutive odd integers such that the quotient of the second and the third integers is 3(integers are x and x plus 2)