Question
Wesley can paint 1 flat in 5 days. With Riordan's help, they can paint the same flat in 4 days. How many days would Riordan take to paint the flat alone?
4 m

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Wesley can paint 1 flat in 5 days. With Riordan's help, they can paint the same flat in 4 days. How many days would Riordan take to paint the flat alone?