Would it make a difference?

Logic Level 4

I have 4 hourglasses: Hourglass A measured 7 minutes, Hourglass B measured 11 minutes, Hourglass C measured 23 minutes, Hourglass D measured 37 minutes.

If the objective is to minimize the number of times to turn the hourglasses, which 2 of the 4 hourglasses should I choose if I want to measure 71 minutes?

This is the continuation of my other problem.
Image Credit: Flickr oozhan.

Problem Loading...

Note Loading...

Set Loading...