*This series is designed to help you step up your Data Sufficiency practice while we all spend a little extra time at home during the coronavirus situation; I’m going to publish one practice Data Sufficiency question each day! You can choose to do all of them, or none of them. *

*Click on the tag “Social Distancing DS Challenge” at the bottom of this post to see all of the questions in this series! *

*And remember to take whatever precautions you need to stay healthy over the next few weeks! *

**Question #20**

If *x – y = z*, what is the value of *y*?

(1) *x* = 7

(2) *z = x *+ 4

**Explanation**

Statement (1) is insufficient because, if we plug in *x* = 7 we are left with: 7 –* y = z … *and we still are unable to solve for *y*‘s value.

Let’s try plugging in statement (2): *x – y = z … x – y* = (*x* + 4) … *-y *= 4 … *y* = -4: Statement (2) alone is sufficient! The correct answer is (B).

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