SOLUTION: how do you find missing numbers on a number line when they are equal distances apart? ex: 21 ___ ___ 63 ___ ___

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Question 360972: how do you find missing numbers on a number line when they are equal distances apart?
ex:
21 ___ ___ 63 ___ ___

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
The next number would be 21%2Bd.
The number after that would be %2821%2Bd%29%2Bd.
The next number would then be %28%2821%2Bd%29%2Bd%29%2Bd=63.
21%2B3d=63
3d=42
d=14
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.
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(21,35,49,63,77,91)