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Gravel

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Manager
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Joined: 21 Feb 2009
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Kudos [?]: 44 [0], given: 4

Gravel [#permalink] New post 19 Jul 2009, 00:54
00:00
A
B
C
D
E

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(N/A)

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0% (00:00) correct 0% (00:00) wrong based on 0 sessions
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Manager
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Joined: 18 Jul 2009
Posts: 170
Location: India
Schools: South Asian B-schools
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Kudos [?]: 68 [0], given: 37

Re: Gravel [#permalink] New post 19 Jul 2009, 14:04
x tons (10%) + y tons (2%) => z = x+y tons (5%)
hence x/y = constant (mixture property)

1) y = 10 > x can be calculated
2) z = 16 > y= 16-x ... can be calculated

hence D
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Bhushan S.
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Kudos [?]: 68 [0], given: 15

Re: Gravel [#permalink] New post 19 Jul 2009, 19:15
0.1x+0.2y = 0.5X .... 1

x+y=Z ..... 2


So we have two equations and three variables. if we know one of the variables then we can solve for the other two.
Re: Gravel   [#permalink] 19 Jul 2009, 19:15
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