It is 13
the number between 2 and 20 is 11
The number 8 is halfway between 5 and 11. It is 3 more than 5 and 3 less than 11. To find a halfway point (which is also the average), add the numbers together and divide by 2.
It is (10.7 + 11)/2 = 10.85
the halfway point is 10.5 or 10 and a half
15
11
It is 13
the number between 2 and 20 is 11
The number 8 is halfway between 5 and 11. It is 3 more than 5 and 3 less than 11. To find a halfway point (which is also the average), add the numbers together and divide by 2.
It is (10.7 + 11)/2 = 10.85
It is 47, the number halfway between the two of them.
the number between 11 and 12 is obvious. it is 11 and a half
the halfway point is 10.5 or 10 and a half
11.. 7+4=11 and 15-4=11
There is no "the" rational" number since there is an infinity of them. Start with the number halfway between the two: (1/10+1/11)/2 = 21/220. Then try halfway between 1/10 and 21/220, and then halfway between 1/10 and that on. And so on.
Add 1/4 and 2/3. This results in 11/12. Then divide by 2 (or multiply by 1/2). The answer is 11/24 or about .458333.