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If x men working x hours per day can do ...

If x men working x hours per day can do x units of work in x days, then y men working y hours per day in y days would be able to do k units of work. What is the value of k ?

A

`x^2 y^(-3)`

B

`x^3 y^(-2)`

C

`y^2x^(-3)`

D

`y^3 x^(-2)`

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