CEMC Pascal, 1998

Algebra Difficulty 1.0 Junior Find the answer Canada

The number in an unshaded square is obtained by adding the numbers connected to it from the row above. (The '11' is one such number.) The value of $x$ is

(A) $4$ (B) $6$ (C) $9$ (D) $15$ (E) $10$

Figure for this problem

We don't reproduce this publisher's solutions. Their own solution is here — work the problem first.

Want a route through all this instead of an archive? The track puts 2,604 problems in a working order, from Junior Challenge level to the IMO shortlist.

Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.