285+325=610/2= 305
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21 including 285 & 325 !
The number half way between them is their mean average (295 + 325) ÷ 2 = 305
it is 325
1, 5, 13, 25, 65, 325
.8-.15=.65 so this is the distance between them. Half that distance is .325. Now .325 to .15 or subtract it from .8 and we have the number in the middle. .475 is the number exactly in the middle. This might be easier to see with some integers. Take 6 and 8 and we want to know what number is in the middle. Of course we know it is 7. But 8-6 is 2 so that is the distance between them. Now add 1/2 of that, which is 1 to 6 or subtract it from 8 and you have 7. So .325 is the distance between the two numbers, .475 is the number that would be equidistant from both on the number line.