The answer is 20.
In each addition, the individual digits are added together (1+2+3+5+4 = 15)
The answer would be 20.
x=5
If: x+10 = 15 then x = 5
It is: 5+10 = 15
18 + 10 + 20 + 30 + 15 + 50= 143
The answer is 27. 10+15=25. 25+2=27.
-15 over 23
If: x/3 + 10 = 15 Then: x = 15
No.
71
few errors in your title: 2 plus 4 = 6 6 plus 9 = 15 10 plus 25 = 35 18 + 81 = 99
s = -70
24