the number between 2 and 20 is 11
8
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
13
the number between 2 and 20 is 11
8
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.
11.. 7+4=11 and 15-4=11
the halfway point is 10.5 or 10 and a half
The smallest number divisible by 5 7 9 11 13 and 15 is 45,045.
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.