18 plus 20 is 38 how could you not know that,it is such an easy question
16 + 16 + 16 + 17 + 18 + 18 + 18 + 19 + 19 + 20 + 20 + 20 + 21 = 238
18 + 10 + 20 + 30 + 15 + 50= 143
32+14+20+18+16+31+21+16=168
2 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20 = 106
20 = 400
16 + 16 + 16 + 17 + 18 + 18 + 18 + 19 + 19 + 20 + 20 + 20 + 21 = 238
20+18+13+9=60
24 + 18 + 20 + 22 = 84
12 + 16 + 18 + 20 + 9 = 75
18 + 10 + 20 + 30 + 15 + 50= 143
109 you can plus like this: (19+1)+20+20+(1+1+18)+4+25
The answer you may be looking for is 20. 18 + 20 = 38
18 + 2 = 20
32+14+20+18+16+31+21+16=168
13 plus -8 = 5 ... and -18 plus -2 = -20.
21
2 + 18 = 20
2 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20 = 106
9 plus 11 (20) plus 15 (35) plus 18 is equal to 53
If: m = 20 Then: 3m+18 = 78
If: x+18 = 20 Then: x = 2
-2 + (-18) = -20
19 + 1 = 20
20 + 10 - 12 = 18
72