Data Sufficiency (DS) | Re: Three machines, a, b, c, individually can do a certain job. What is th

I have a question here. So the statements individually are clearly not sufficient. But together, If we assume the number of units then we get the same ratio for the work completed. So is this assumption wrong because we are not given any detail about the total units done.Now if we assume the work to be of 35 units then a does 7 unit/hour and b does 5unit/hour , therefore the remaining 23 units is done by c. The required fraction is 23+7=30
30/37=6/7 (This ratio is a constant but we have to assume
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