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Data Sufficiency (DS) | Re: A certain water tank has two outlet valves, valve A and valve B. Each

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Suruchim12 wrote:
GMATGuruNY

I have a question with regards to the approach yo have shared. In that, we have assumptions made at 2 steps ; 1 where we assume the tank capacity to be 3 gallons and next when we assume that Valve A when it works on its own for an hour -- empties 1 gallon of the 3-gallon tank.

While the first assumption is understandable. the 2nd assumption isnt something that I'd think of in the exams if I was faced with this problem. Therefore, Is there an alternative approach to
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