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Is rs = rx − 2?

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by VJesus12 » Thu Jun 28, 2018 5:16 am

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Difficulty—

Is rs = rx − 2 ?

(1) r is an odd number
(2) x = s + 2

The OA is the option E.

Using both statements together is not sufficient? Please, anyone, explain this DS question to me. <i class="em em-frowning"></i>
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Source: — Data Sufficiency |

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by Jay@ManhattanReview » Fri Jun 29, 2018 12:11 am
VJesus12 wrote:Is rs = rx − 2 ?

(1) r is an odd number
(2) x = s + 2

The OA is the option E.

Using both statements together is not sufficient? Please, anyone, explain this DS question to me. <i class="em em-frowning"></i>
We have to determine whether rs = rx − 2.

Let's take each statement one by one.

(1) r is an odd number.

Certainly insufficient as we do not have any info about r, s, and x.

(2) x = s + 2

Certainly insufficient as we do not have any info about r.

(1) and (2) together

We still do not have the unique value of r. r can be any number 1, 3, 5, 7,... Insufficient.

The correct answer: E

Hope this helps!

-Jay
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