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23 May 2018, 18:40
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If x is positive, what is the value of y ?
(1) 5x = 15
(2) xy + y = 18
(1) 5x = 15
(2) xy + y = 18
23 May 2018, 21:56
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If x is positive, what is the value of y ?
(1) 5x = 15 --> x = 3. We know nothing about y. Not sufficient.#
(2) xy + y = 18. Infinitely many pairs of (x, y) satisfy this. For example, x = 1 and y = 9; x = 2 and y = 6; ... Not sufficient.
(1)+(2) Since x = 3 from (1), then y = 18/4 from (2). Sufficient.
Answer: C.
P.S. Is this a new question from GMAT Prep?
(1) 5x = 15 --> x = 3. We know nothing about y. Not sufficient.#
(2) xy + y = 18. Infinitely many pairs of (x, y) satisfy this. For example, x = 1 and y = 9; x = 2 and y = 6; ... Not sufficient.
(1)+(2) Since x = 3 from (1), then y = 18/4 from (2). Sufficient.
Answer: C.
P.S. Is this a new question from GMAT Prep?
