When you ask "What number is halfway between 20 and 185?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=20 and Y=185.
To find the number halfway between 20 and 185, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 185 into our formula, we get:
(20 + 185)/2 = 102.5
Thus, the number halfway between 20 and 185 is 102.5.
To check that our answer is correct, we subtract 20 from 102.5 and subtract 102.5 from 185 and compare the two numbers:
102.5 - 20 = 82.5
185 - 102.5 = 82.5
As you can see, the halfway number is 82.5 higher than 20 and 82.5 lower than 185. Therefore, our halfway between answer of 102.5 above is correct.
Halfway Between
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Halfway Between 20 and 186
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