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In assembling a Bluetooth device,

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Intern
Intern
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Joined: 19 Feb 2013
Posts: 10
Followers: 0

Kudos [?]: 0 [0], given: 1

In assembling a Bluetooth device, [#permalink] New post 21 Feb 2014, 17:34
00:00
A
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C
D
E

Difficulty:

  55% (hard)

Question Stats:

58% (02:27) correct 42% (01:47) wrong based on 24 sessions
In assembling a Bluetooth device, a factory uses one of two kinds of modules. One module costs $6.25 and the other one, that is cheaper, costs $2.50. The factory holds a $70 worth stock of 22 modules. How many of the modules in the stock are of the cheaper kind?

(A)4
(B)8
(C)12
(D)16
(E)18
[Reveal] Spoiler: OA
Manager
Manager
avatar
Joined: 19 Apr 2013
Posts: 74
Concentration: Entrepreneurship, Finance
Schools: Yale '16, ISB '15, NUS
GMAT Date: 04-30-2014
GPA: 3.88
WE: Programming (Computer Software)
Followers: 1

Kudos [?]: 41 [0], given: 7

GMAT ToolKit User
Re: In assembling a Bluetooth device, [#permalink] New post 21 Feb 2014, 22:21
anujtsingh wrote:
In assembling a Bluetooth device, a factory uses one of two kinds of modules. One module costs $6.25 and the other one, that is cheaper, costs $2.50. The factory holds a $70 worth stock of 22 modules. How many of the modules in the stock are of the cheaper kind?

(A)4
(B)8
(C)12
(D)16
(E)18


It is easy go : consider x is count of costlier module. y is count of cheaper module.

6.25*x + 2.5*y = 70;
x+y = 22;

by solving these two equation we get y = 18
_________________

Thanks,
AB

+1 Kudos if you like and understand.

Re: In assembling a Bluetooth device,   [#permalink] 21 Feb 2014, 22:21
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In assembling a Bluetooth device,

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