Question

Ricardo bought one half dozen donuts for his family family members ate one half of the donut how many were left for ricardo to eat

Answer 1

If Ricard bought one half dozen, a dozen donuts we know is 12 so half a dozen is 6.
If they ate half of one donut that is 5 1/2 donuts. 
If they ate half of the half dozen that is 3 donuts.