Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
1) Z=12 so XY=12 sufficient
2) X+Y+Z=20 sufficient because say Z is the largest number, so Z=20 - Y -X
therefore it must be that XY=20 - Y - X, it works for X and Y being equal to 2 or 6
so XY=12 and no others
HBS: Reimagining Capitalism: Business and Big Problems : Growing income inequality, poor or declining educational systems, unequal access to affordable health care and the fear of continuing economic distress...