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What is the value of xy ? (1) x + y = 3 (2) (x – 1)(y – 1) = 4

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What is the value of xy ? (1) x + y = 3 (2) (x – 1)(y – 1) = 4 [#permalink]

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New post 06 Aug 2017, 07:43
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A
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Difficulty:

  35% (medium)

Question Stats:

80% (00:24) correct 20% (02:24) wrong based on 40 sessions

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Kudos [?]: 132771 [0], given: 12372

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What is the value of xy ? (1) x + y = 3 (2) (x – 1)(y – 1) = 4 [#permalink]

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New post 06 Aug 2017, 11:30
To find xy= ?

(1) x + y = 3
Not sufficient

(2) (x – 1)(y – 1) = 4
=> xy - x - y +1 = 4
=> xy -(x+y) = 3
Not sufficient

Combining 1 and 2, we get
xy -3 = 3
=> xy = 6

Sufficient

Answer C
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Kudos [?]: 1005 [0], given: 80

What is the value of xy ? (1) x + y = 3 (2) (x – 1)(y – 1) = 4   [#permalink] 06 Aug 2017, 11:30
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