# 考满分网

Working simultaneously and independently at an identical constant rate, 4 machines of a certain type can produce a total of x units of product P in 6 days. How many of these machines, working simultaneously and independently at this constant rate, can produce a total of 3x units of product P in 4 days?
• A24
• B18
• C16
• D12
• E8

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• 所属科目:数学PS
• 题目来源1:OG16-76
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