<PRE><B>Question 925137</B>
r = houses/(people*time)
r = 20/(10*30) = 10/(5*time)
20/(10*30) = 10/(5*time)
5*20/(10*30)/10 = 1/time
time = 1/( 5*20/(10*30)/10 )
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answer:
time = 30 days
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