exam Maths Puzzle Numerical Ability

This is another one that has me stumped.

Please solve:

1+(a/b) / 1-(a^2/b^2)

Thanx for your help!

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exam Other Question

Cheryl is dividing her soccer team into 5 groups, 1/2 are forwards,1/6 are halfbacks,1/6 are wings,1/12 are fullbacks and 2 others are goalies. How many players are there on the team and how many in each group? An oriental rug manufacturer can use one loom with a setup cost of $750 that can weave a rug for $115. Another loom, with a setup cost of $950, can produce a rug for $95. How many rugs are produced if the costs are the same on each loom?