*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 #11**

A rope has four knots labeled *A, B, C*, and *D*, in that order. What is the rope distance between knots *B* and* C*?

(1) The rope distance between knots *A* and *C* is 5 feet.

(2) The rope distance between knots *B* and *D* is 7 feet.

**Explanation**

Neither of the statements alone is sufficient. It may be tempting to think that together the statements can answer the question — by subtracting the two distances. Even combined, however, the information is insufficient.

We have no information about the distances between *A* and *B* or between *C* and *D*. If you’re having a tough time understanding this one, try drawing a couple examples where the distance of *BC* varies even when *AC* is 5 and *BD* is 7 to prove it. The correct answer is (E).