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

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Each of six students, four girls and two boys, spent an [#permalink] New post 03 Sep 2008, 01:43
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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.
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Re: books DS [#permalink] New post 03 Sep 2008, 06:25
hmmm.... not interesting? how come no ans?
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Re: books DS [#permalink] New post 03 Sep 2008, 06:39
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

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Re: books DS [#permalink] New post 03 Sep 2008, 11:33
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, 11:33
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