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Sentence 1 tells us the LCM of x/y and 1/3 but don't know what the value of x is, if it's multiple of y then we can't use this information reliably. So using what Sentence 2 tell us, we can find the value of y (= 2, btw).
since it is asking for a certain value, u cannot decide based on the data, it is not sufficient,
when a question like those ask for certain values, the answer should be exact value if the equation is solved