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values for the expression

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Intern
Joined: 02 May 2008
Posts: 2

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values for the expression [#permalink]

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05 May 2008, 07:06
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Can somebody please help me with the following problem:
THanks in advance

If a, b, and c are three different digits and can have any one of the
following values: 3, 5, or 7, what is the difference between the largest possible
value and the least possible value for the expression (a/b)/c?

Answers:
(A) 7/15 (B) 3/35 (C) 8/21
(D) 8/35 (E) 1/5

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Intern
Joined: 07 Jan 2006
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Re: values for the expression [#permalink]

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05 May 2008, 07:51
(a/b)/c = (a/b)(1/c) = a/bc

a = 7, bc = 15, a/bc = 7/15
a = 3, bc = 35, a/bc = 3/35

7/15 - 3/35 = 7(35)/15(35) - 3(15)/35(15) = (245-45)/525 = 200/525 = 8/21

C

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Intern
Joined: 28 Mar 2008
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Re: values for the expression [#permalink]

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05 May 2008, 11:55
C
7/3*5 - 3/7*5
=8/21

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Re: values for the expression   [#permalink] 05 May 2008, 11:55
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values for the expression

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