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What is the value of e?

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Source: — Data Sufficiency |

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by Jay@ManhattanReview » Mon Oct 30, 2017 9:54 pm
swerve wrote:$$a+b=8$$
$$b+c+d=9$$
$$c+d+e=10$$

What is the value of e?

$$(1)\ c=3$$
$$(2)\ a=2$$

The OA is B.

Please, can any expert assist me with this DS question? I don't have it clear. Thanks.
We have
$$a+b=8 ---(1)$$
$$b+c+d=9 ---(2)$$
$$c+d+e=10 ---(3)$$

Let's do (1) - (2) + (3), and check the result...

Hope this helps!

-Jay

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