exam Maths Puzzle Numerical Ability

"how do you answer these quistions i do not get it?"

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exam Other Question

Simplify

y/b + x/b
____________
y/b - x/b
Variables using

input output
1 -> 3
2 -> 5
3 -> 9
4 -> 17
5 -> 33

How do you get the answer?</PRE>