book Maths Puzzle Numerical Ability

can you please show me haw to answer the following question.
Simplify
3/a^3 + 7/5a / a^2 + 1/2

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book Other Question

A liter of cream contains 9.5 percent butterfat. How much skim milk containing 5.5 percent butterfat must be added to the mixture to obtain a mixture with 6.5 percent butterfat? please solve this n=324/36*3