It's still 4. The first number always represents "1", in any base.
9/10 + 2/3 = 27/30 + 20/30 = 47/30 or 1 and 17/30
7/10 + 3/5 + 2/3 = 21/30 + 18/30 + 20/30 = 59/30 = 129/30
12/30 + 5/30 = 17/30
1/6 + 2/5 = 5/30 + 12/30 = 17/30
9/10 + 2/3 = 47/30 or 117/30
It is: 13/30
If: k/2 + 9 = 30 Then: k = 42
1/10 + 2/3 = 3/30 + 20/30 = 23/30.
1/10 + 5/6 + 2/3 = 3/30 + 25/30 + 20/30 = 48/30 = 16/10 or 13/5
7 19/30
1/2 + 1/15 = 17/30
2/3 + 9/10 = (2x10)/(3x10) + (9x3)/(10x3) = 20/30 + 27/30 = 47/30 = 1 17/30