A) 15 days
B) 30 days
C) 60 days
D) 120 days
Correct Answer: D
Solution :
\[\because \]10 people can paint 60 houses in = 120 days \[\therefore \]1 people can point 1 house in \[=\frac{120\times 10}{60}=20\,\,days\] \[\therefore \]5 people can paint 30 houses in \[=\frac{20\times 30}{5}=120\,\,days\]
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