They don't, the closest you can it get is from 9+10, which is 19, or 10+11, which is 21. Decimals aren't really considered consecutive numbers.
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They are: 20+21 = 41
The two consecutive whole numbers that 20 lies between are 19 and 21. This can be determined by recognizing that 20 is the average of 19 and 21. In other words, (19 + 21) / 2 = 20. This demonstrates that 20 is exactly halfway between 19 and 21 in the number line.
It is 20 because 18+20 = 38
The numbers are 18 and 20.
The numbers are: 76 and 20