Assembly parts

Nine machines produce 1,800 parts on nine machines. How many hours will it produce 2 100 parts on seven such machines?

Correct answer:

t =  12 h

Step-by-step explanation:

$$\begin{gathered} s=1800\mathrm{/}(9\cdot 8)=25 \\ t=2100\mathrm{/}(7\cdot s)=2100\mathrm{/}(7\cdot 25)=12\text{ h} \end{gathered}$$

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