If x men working x hours per day can do x units of works in

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If x men working x hours per day can do x units of works 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?

[CDS II 2020 Mathematics Past paper]

x²y^–3

x³y^–2

y²x^–3

y³x^–2