Q11:
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?
A. 24
B. 18
C. 16
D. 12
E. 8
the answer is B
我的算法是4台機器下,6天生產x單位,所以1天就生產x/6單位
則4台機器,4天生產4x/6
要生產到3x 所以3x除以4x/6得9/2
這表示9/2 個4台機器
所以相乘 為18
有人有更好或是簡單的算法嗎???
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