How to find a solution to a compound fraction - SSAT Upper Level Quantitative

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Question

Simplify:

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Answer

Simplify into a complex fraction for the numerator and denominator.

For the numerator, we need to multiply then the top should read .

For the bottom, we need to multiply in order to add the components. Thus the bottom should read .

Dividing fractions is the same as multiplying the numerator by the reciprocal of the denominator.

Therefore, multiply top and bottom by and then you should see that if you factor a on the bottom, the cancels along with the .

The answer then should be .

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