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 result:

t =  12 h

Solution:

s=1800/(9⋅ 8)=25 t=2100/(7⋅ s)=2100/(7⋅ 25)=12 hs=1800 / (9 \cdot \ 8)=25 \ \\ t=2100/(7 \cdot \ s)=2100/(7 \cdot \ 25)=12 \ \text{h}

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