exam Maths Puzzle Numerical Ability

The density of a block of wood is 0.64g/cm^3. What is the volume of the block if its mass is 29 g?

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Need help solving this:
(c-2)(2c^2-3c+1)
multiply

-3a^2b
over
35a^5
multiplied by
14a^3b^2
over
-9b^4