Question 6
Seven $3\times1$ bars lie in the $5\times5$ box as shown. Slide bars within the box, without rotating or removing them, to make room for one more identical bar. What is the minimum number of existing bars that must be moved?
Editorial clarification: Austria says “rearrange”. Scoring uses the primary paper’s sliding rules: no rotation or removal.
Editorial clarification: Austria says “rearrange”. Scoring uses the primary paper’s sliding rules: no rotation or removal.