Incorrect, I am averaging the percentages of the votes, not the number who actually voted.
I thought that was obvious
60+40 =100 , 83+17 =
100 , 71+29 .......wait for it =
100 
I know you like detail, so just for you, to prevent any more confusion
In
mathematics, a
percentage is a way of expressing a number as a
fraction of 100 (
per cent meaning "per hundred"). It is often denoted using the
percent sign, "%". For example, 45% (read as "forty-five percent") is equal to 45 / 100, or 0.45.
Percentages are used to express how large one quantity is relative to another quantity. The first quantity usually represents a part of, or a change in, the second quantity, which should be greater than zero. For example, an increase of $ 0.15 on a price of $ 2.50 is an increase by a fraction of 0.15 / 2.50 = 0.06. Expressed as a percentage, this is therefore a 6% increase.
Although percentages are usually used to express numbers between zero and one, any
dimensionless proportionality can be expressed as a percentage. For instance, 111% is 1.11 and −0.35% is −0.0035.