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# M04 Q33

Author Message
Manager
Status: And the Prep starts again...
Joined: 03 Aug 2010
Posts: 136

Kudos [?]: 61 [0], given: 20

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09 Mar 2012, 06:54
In the office supply store, Brittany bought 17 pens of three kinds: ball pens, gel pens, and ink pens, which cost $0.05,$0.10 and $0.25 each. The total that Brittany paid was$2.05. If Brittany bought twice as many gel pens as ink pens, how many ball pens did she buy?

A. 4
B. 5
C. 7
D. 8
E. 10
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My First Blog on my GMAT Journey

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Kudos [?]: 61 [0], given: 20

TOEFL Forum Moderator
Joined: 16 Nov 2010
Posts: 1602

Kudos [?]: 600 [1], given: 40

Location: United States (IN)
Concentration: Strategy, Technology

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09 Mar 2012, 07:22
1
KUDOS
1
This post was
BOOKMARKED
X – Ball Pen
Y – Gel Pen
Z – Ink Pen
X+y+z = 17
0.05x + 0.10y + 0.25z = 2.05
5x + 10y + 25z = 205
X + 2y + 5z = 41
=> Y + 4z = 24
Now, y = 2z
=> 6z = 24
=> Z = 4 , y = 8
=> X = 17 – 12 = 5
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Kudos [?]: 600 [1], given: 40

Manager
Status: And the Prep starts again...
Joined: 03 Aug 2010
Posts: 136

Kudos [?]: 61 [0], given: 20

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09 Mar 2012, 08:53
Nice explanation. Thanks.

I am not sure how I can add this to the master thread though. Hope the admins will take care of that.
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My First Blog on my GMAT Journey

Arise, Awake and Stop not till the goal is reached

Kudos [?]: 61 [0], given: 20

Manager
Joined: 13 May 2010
Posts: 122

Kudos [?]: 24 [0], given: 4

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20 Jul 2012, 03:08
If $$ab \ne 0$$ and $$|a| \lt |b|$$ , which of the following must be negative?

$$\frac{a}{b} - \frac{b}{b}$$
$$\frac{a - b}{a + b}$$
$$a^b - b^a$$
$$a \frac{b}{a - b}$$
$$\frac{b - a}{b}$$

OA: b

OE uses algebraic approach. I tried using number testing to solve. But could not come up with a number plug that could prove (A) false .....please suggest some value to prove A wrong.

Kudos [?]: 24 [0], given: 4

Math Expert
Joined: 02 Sep 2009
Posts: 42249

Kudos [?]: 132595 [0], given: 12326

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20 Jul 2012, 03:18
teal wrote:
If $$ab \ne 0$$ and $$|a| \lt |b|$$ , which of the following must be negative?

$$\frac{a}{b} - \frac{b}{b}$$
$$\frac{a - b}{a + b}$$
$$a^b - b^a$$
$$a \frac{b}{a - b}$$
$$\frac{b - a}{b}$$

OA: b

OE uses algebraic approach. I tried using number testing to solve. But could not come up with a number plug that could prove (A) false .....please suggest some value to prove A wrong.

Discussed here: m14-134213.html
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Kudos [?]: 132595 [0], given: 12326

Re: M04 Q33   [#permalink] 20 Jul 2012, 03:18
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# M04 Q33

Moderator: Bunuel

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