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If ab = c what is the value of bc?

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If ab = c what is the value of bc? [#permalink]

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New post 25 Jan 2011, 07:12
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If ab = c what is the value of bc?

(1) a = 18/b^2
(2) b = 3

[Reveal] Spoiler:
i had a doubt here if S1 was rephrased as a = -18 / b^2 what would the answer be ?
[Reveal] Spoiler: OA

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Re: DS Algebra [#permalink]

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New post 25 Jan 2011, 07:47
Expert's post
rxs0005 wrote:
If a*b = c what is the value of b*c

1. a = 18 / b^2
2. b = 3

i had a doubt here if S1 was rephrased as a = -18 / b^2 what would the answer be ?


If a*b = c what is the value of b*c?

(1) a = 18 / b^2 --> a*b^2=18 --> (a*b)*b=18 --> c*b=18. Sufficient.

(2) b = 3. Clearly insufficient.

Answer: A.

If statement (1) were: a=-18/b^2 then a*b^2=-18 --> (a*b)*b=-18 --> c*b=-18 (for example: a=-2, b=3). Sufficient.
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Re: DS Algebra [#permalink]

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New post 26 Jan 2011, 02:35
a*b = c ==> a*b^2 = b*c (multiply by b each side)

1) a = 18/b^2 ==> a*b^2 = 18 => b*c = 18 SUFF

2) Clearly INSUFF

A
Re: DS Algebra   [#permalink] 26 Jan 2011, 02:35
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