book Maths Puzzle Numerical Ability

The teacher is asking me to simplify this complex fraction.
1
----- +1
a
--------
1
---- -1
a

I am struggling with this problem so any help is appreciated.

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book Other Question

Can a trapezoid have three right angles? The petty-cash drawer of a small office contained $16.25. If there were twice as many nickels as quarters and as many dimes as nickels and quarters combined; how many coins of each type were there?