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Manager
Joined: 12 Oct 2008
Posts: 103

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14 Nov 2008, 17:20
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If 4XZ + YW = 3 and XW + YZ = 6, what is the value of the expression
(2X + Y)(2Z + W)?

(a) 9.
(b) 12.
(c) 15.
(d) 16.
(e) 18.

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Manager
Joined: 23 Jul 2008
Posts: 189

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14 Nov 2008, 17:28
(2X+Y)(2Z+W)= (4XZ+YW) + 2(XW+YZ)= 3+2(6) = 15
VP
Joined: 05 Jul 2008
Posts: 1366

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15 Nov 2008, 13:20
Yep. 15.

Just multiply out the required and plug in values.

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Re: PS   [#permalink] 15 Nov 2008, 13:20
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