The answer is 3 and 5/18.
2 + 1 = 3, of course. Please see the linked question below for an explanation as to why the fractions equal 5/18.
It is: 10
one and two sixth's
3
it equals five sixth.
one half is greadest
25/63
Four and one sixth.
Nine and five sixth
it's 2/3 (two thirds)
That would be seven ninths.
7/9
5 sixths