Neither.
LCM of 110 and 220 is 220.
In the U.S. you should be using 110-115V.
110 x 2 = 220
200. That is to say, 220 is 110% of 200.
110
For electrical purposes 110-115-120 is all the same.
5-115 = -110
220 ÷ 2 = 110
110 times (220 ÷ 2 = 110).
220 your smart
No country in the world uses 138 volts. They use 100, 110, 115, 120, 127, 210, 220, & 240.
The number in the middle of 220 and 110 is 165. The way I showed work for the equation is I added 220 and 110 together and got 330. Then I divided 330 by 2 and got the final answer of 165.