When you ask "What number is halfway between 20 and 305?" 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=305.
To find the number halfway between 20 and 305, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 305 into our formula, we get:
(20 + 305)/2 = 162.5
Thus, the number halfway between 20 and 305 is 162.5.
To check that our answer is correct, we subtract 20 from 162.5 and subtract 162.5 from 305 and compare the two numbers:
162.5 - 20 = 142.5
305 - 162.5 = 142.5
As you can see, the halfway number is 142.5 higher than 20 and 142.5 lower than 305. Therefore, our halfway between answer of 162.5 above is correct.
Halfway Between
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Halfway Between 20 and 306
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