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GMAT OG 13

This topic has 2 expert replies and 1 member reply
nishatfarhat87@gmail.com Master | Next Rank: 500 Posts
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GMAT OG 13

Post Thu May 16, 2013 1:55 pm
132. Joanna bought only $0.15 stamps and $0.29 stamps.
How many $0.15 stamps did she buy?

(1) She bought $4.40 worth of stamps.
(2) She bought an equal number of $0.15 stamps
and $0.29 stamps.

Can someone explain to me why is statement 2 insufficient? Cant it be written as 0.15(x) + .29(y) = 4.40
since, x=y so we replace y=x in the equation above. Please explain?

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Post Fri May 17, 2013 8:10 am
Be very careful to evaluate each statement individually! You were using what we called "statement carryover" - you were using the information from statement 1 in evaluating statement 2. This is a very easy mistake to make, but it will really hurt your score! You have to "forget" what you knew from the previous statement. I find that it's helpful to actually hold your hand over the first statement so you can only see the second one.

Focus on trying to PROVE INSUFFICIENCY! With the second statement, here are some possible scenarios:

one of each stamp: $0.15 + $0.29
100 of each: $15 + $29
10,000 of each: $1500 + $2900

As we can see, there's no way to tell how many $0.15 stamps we have.

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Manhattan Prep GMAT & GRE instructor
EdM in Mind, Brain, and Education
Harvard Graduate School of Education


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Top Reply
Post Thu May 16, 2013 2:06 pm
nishatfarhat87@gmail.com wrote:
132. Joanna bought only $0.15 stamps and $0.29 stamps.
How many $0.15 stamps did she buy?

(1) She bought $4.40 worth of stamps.
(2) She bought an equal number of $0.15 stamps
and $0.29 stamps.

Can someone explain to me why is statement 2 insufficient? Cant it be written as 0.15(x) + .29(y) = 4.40
since, x=y so we replace y=x in the equation above. Please explain?
In statement 2, all we know is that Joanna bought an equal number of $0.15 stamps and $0.29 stamps.
We don't know that she spent $4.40 (that info is in statement 1)

Cheers,
Brent

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Post Fri May 17, 2013 8:10 am
Be very careful to evaluate each statement individually! You were using what we called "statement carryover" - you were using the information from statement 1 in evaluating statement 2. This is a very easy mistake to make, but it will really hurt your score! You have to "forget" what you knew from the previous statement. I find that it's helpful to actually hold your hand over the first statement so you can only see the second one.

Focus on trying to PROVE INSUFFICIENCY! With the second statement, here are some possible scenarios:

one of each stamp: $0.15 + $0.29
100 of each: $15 + $29
10,000 of each: $1500 + $2900

As we can see, there's no way to tell how many $0.15 stamps we have.

_________________


Ceilidh Erickson
Manhattan Prep GMAT & GRE instructor
EdM in Mind, Brain, and Education
Harvard Graduate School of Education


Manhattan Prep instructors all have 99th+ percentile scores and expert teaching experience.
Sign up for a FREE TRIAL, and learn why we have the highest ratings in the GMAT industry!

  • +1 Upvote Post
  • Quote
  • Flag
Free Manhattan Prep online events - The first class of every online Manhattan Prep course is free. Classes start every week.

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