i am wondering what can be the source of the problem. The only way B could also be an independent answer is when B says- "r divided s = 75/100". May be we are misreading the divided sign to "+". Because thats what the 1st statement means.
by the looks of what is written (considering B says r+s= 75/100) ... the answer has to be A. because there is no way to give the answer with that information alone.
hope it helps
DS- percents
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Source: Beat The GMAT — Data Sufficiency |












