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

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Math Expert
Joined: 02 Sep 2009
Posts: 54440
What is the value of xy ? (1) x + y = 3 (2) (x – 1)(y – 1) = 4  [#permalink]

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06 Aug 2017, 07:43
00:00

Difficulty:

35% (medium)

Question Stats:

88% (00:57) correct 13% (02:31) wrong based on 48 sessions

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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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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

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

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