A new Ruler
A foot ruler is very 'wasteful' as there is twelve different ways of measuring 1 inch directly, 11 different ways of measuring 2 inches directly etc. What is the smallest number of marks you need to make in order to be able to measure directly each whole number from 1 to 12. (Assuming the ruler is exactly 1 foot so the ends can be used as 'invisible marks')
The answer is 4.
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
0 solutions
No explanations have been posted yet. Check back later!