用中文回答`数学问题测IQ
Ten people can paint 60 houses in 120 days,so five people can paint 30 houses in:
A.15 days
B.30 days
C.60 days
D120 days (我需要分析 用中文分析,看了一天英文了)
我不需要翻译题目```(我懂``)我要分析的详细点,一步一步具体来```