Q: What number is halfway between 13 and 21?

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34

19.5 is halfway between 18 and 21

21

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

42

The answer is 1414

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 + 69)/2 = 90/2 = 45

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

There is no distance between them.

37The answer is 37It is: 37

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.