Count in base 13.
8+1+5+5+3+8+10+30=70 The answer is 70
5+5=10 6+8=14 14+10=24
8*10 plus 5*10 = 130
5 + 5*10 + 8 = 5 + 50 + 8 = 63
5 plus 8
4 + 5 -2 + 8 - 5 is = 10
5+8 is the same as 10+3 = 13
8( 6 - 5) + 10 = 18
5 + 8 - 3 = 10
120
8/10 + 4/5 = 8/5 or 13/5
3/10+5/8 = 37/40