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# Each of six students, four girls and two boys, spent an

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Joined: 11 May 2008
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Each of six students, four girls and two boys, spent an [#permalink]  03 Sep 2008, 00:43
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Each of six students, four girls and two boys, spent an average of $60 on books. If the girls spent a total amount of$300, how much did boy X and Y spend on books?
(1) X spent twice as much as Y spent on books.
(2) X spent $20 more than Y on books. Current Student Joined: 11 May 2008 Posts: 560 Followers: 7 Kudos [?]: 59 [0], given: 0 Re: books DS [#permalink] 03 Sep 2008, 05:25 hmmm.... not interesting? how come no ans? SVP Joined: 07 Nov 2007 Posts: 1824 Location: New York Followers: 29 Kudos [?]: 564 [0], given: 5 Re: books DS [#permalink] 03 Sep 2008, 05:39 arjtryarjtry wrote: Each of six students, four girls and two boys, spent an average of$60 on books. If the girls spent a total amount of $300, how much did boy X and Y spend on books? (1) X spent twice as much as Y spent on books. (2) X spent$20 more than Y on books.

six stuendents spend together = 60*6=360
boys spent = 360-300=60
X+Y=60
1) X=2Y
X=40 Y=20 suffcient
2) X=Y+20
X=40 Y=20
SUFFCIENT

D
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Re: books DS [#permalink]  03 Sep 2008, 10:33
D...

From 1:

60= (300+3y)/6
y=20
Suff

From 2:

60= (300+20+2y)/6
y=20
Suff
Re: books DS   [#permalink] 03 Sep 2008, 10:33
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