what is the answer ? can someone please explain ?

Answer:
7
Step-by-step explanation:
A three with a line above it is .33333....repeating and that is equal to [tex]\frac{1}{3}[/tex]. (Just something you learn and have to remember.)
This can be rewritten as
[tex]3\frac{2}{3} +2\frac{1}{3}[/tex]
then we just add
[tex]5\frac{3}{3} =6[/tex]
Hope this helps