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Before you spend too much time on this one - be warned - I [#permalink]
22 May 2007, 10:38

Before you spend too much time on this one - be warned - I don't think the correct answer is amoung the choices; I could be wrong.

Together Andrea and Brian weigh p pounds. Brian weighs 10 pounds more than andrea. Brian and Andrea's dog, Cubby, weighs p/4 more pounds than andrea. In terms of p what is Cubby's weight in pounds?

a (p/2) -10
b (3p/4) -5
c (3p/2)-5
d (5p/4)-10
e 5p-5

Re: PR BIN 4 Errata? [#permalink]
22 May 2007, 10:54

gmatiscoming wrote:

Before you spend too much time on this one - be warned - I don't think the correct answer is amoung the choices; I could be wrong.

Together Andrea and Brian weigh p pounds. Brian weighs 10 pounds more than andrea. Brian and Andrea's dog, Cubby, weighs p/4 more pounds than andrea. In terms of p what is Cubby's weight in pounds?

a (p/2) -10 b (3p/4) -5 c (3p/2)-5 d (5p/4)-10 e 5p-5

Re: PR BIN 4 Errata? [#permalink]
22 May 2007, 11:17

gmatiscoming wrote:

Before you spend too much time on this one - be warned - I don't think the correct answer is amoung the choices; I could be wrong.

Together Andrea and Brian weigh p pounds. Brian weighs 10 pounds more than andrea. Brian and Andrea's dog, Cubby, weighs p/4 more pounds than andrea. In terms of p what is Cubby's weight in pounds?

a (p/2) -10 b (3p/4) -5 c (3p/2)-5 d (5p/4)-10 e 5p-5

A + B = P
B = A + 10
C= A + P/4

By substituting B in the second equation into the first equation, we get:

A + A + 10 = P ==> 2A + 10 = P ==> A = (P-10)/2

Substitute this A into the third equation

C = (P-10)/2 + P/4

Multiply the first value by 2 to get common denominators

Gmatiscoming congratulations ! I believe that you found a mistake in PR !!!

your logic about B+C is correct ! PR wording is wrong.

I have the PR and the mistake clearly comes from Cubby weight. The official explanation states that Cubby weight is P/4 punds more then Andrea while the stem clearly states that Brain and Cubby togther whigh P/4 more then Andrea !!! .

I never even thought to think of singular vs. plural on this question... i guess you really have to be careful on the GMAT; but the line says "Brian and Andrea's dog, Cubby, weighs p/4"

so this almost becomes a grammar question too. but, shouldn't it be
"Brian and Andrea's dog each weigh p/4 pounds more than Andrea"???

Re: PR BIN 4 Errata? [#permalink]
24 May 2007, 07:15

gmatiscoming wrote:

Before you spend too much time on this one - be warned - I don't think the correct answer is amoung the choices; I could be wrong.

Together Andrea and Brian weigh p pounds. Brian weighs 10 pounds more than andrea. Brian and Andrea's dog, Cubby, weighs p/4 more pounds than andrea. In terms of p what is Cubby's weight in pounds?

a (p/2) -10 b (3p/4) -5 c (3p/2)-5 d (5p/4)-10 e 5p-5

Answer is B.

Solve from the options.

put (3p/4) - 5 = A + (p/4)

Solve for A and B and then see which equations satisfies A + B = P

gmatclubot

Re: PR BIN 4 Errata?
[#permalink]
24 May 2007, 07:15