#61 Mark to mark
Set by Katie Steckles
Given a ruler that you know is 6 units long, with a mark 2 units from one end, it is possible to measure distances of 2, 4 and 6 units between some pair of points (using the mark and the ends of the ruler).
Where could you add a second mark to the ruler that would allow you to measure all lengths from 1 to 6 units?
A ruler 11 units in length has a mark at 1. Where can you add two more marks to allow you to measure 10…
