Capgemini Company Numerical Ability Algebra

x^y-y^x=1
then x/y+y/x=?

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Capgemini Other Question

about alternative days of work by a,b
A sum of money becomes 2.5 times itself at 12.5% simple interest p.a.
What should be the period of investment to get this much return?
A. 6 years
B. 8 years
C. 12 years
D. 20 years