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Q: What number is halfway between 18 and 21?

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It is: (18+21)/2 = 19.5

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.

21

(21+29)/2 = 50/2 = 25

(21 + 69)/2 = 90/2 = 45

34

To find the number halfway between any two numbers x and y, add x and y, then divide the answer by 2. So for 21 and 35, 21+ 35 = 56. 56/2 = 28. You can check your answer by seeing that 21 + 7 = 28 and 35 - 7 = 28.

The answer is 1414

seventeen 13 + 4 = 17 = 21 - 4

There is no distance between them.

42

It is 20, the number halfway between the two middle values.

(21+53)/2 = 37

37The answer is 37It is: 37

They are 16, 18 and 20.

It is 23.5, the value halfway between the two middle values when they are listed in order.

42

37

Add 55 and 21, then divide by 2 = 38

Yes.

It is 45 69 +21 = 90 90/2 = 45

Add the absolute value of the two numbers -9 and 33 to get 42. 1/2 of 42 (midway) is 21

Then number half way between them is their mean average: (-3/7 + -15/14) ÷ 2 = (-6/14 + -15/14) ÷ 2 = -21/14 ÷ 2= -21/28 = -3/4

to get the answer, you multiply them both together and divide by 2. 61 divided by 2 is 30.5 30.5 is the answer.

The closest town to the halfway point is Chamblee, GA, situated 21 miles from Marietta, GA and 14 miles from Duluth, GA. It would take 24 minutes to go from Marietta to Chamblee and 18 minutes to go from Duluth to Chamblee.