exam Maths Puzzle Numerical Ability

Please help me solve this complex fraction.

(2/x)
_____________
1 - (1 / y)

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exam Other Question

Rectangular stage. One side of a rectangular stage is 2 meters longer than the other. If the diagonal is 10 meters, than what are the lengths of the sides? daughter needs help, and so do i apparently, sure would like to know the procedure for solving this: 8y+5z=4390
y+z= 680 , any help is more that appreciated,
thanx phil