SOLUTION: 21,____,_____,63 how do I know what goes in between?. How can I find the number

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Question 508797: 21,____,_____,63 how do I know what goes in between?. How can I find the number
Found 2 solutions by scott8148, edjones:
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
there are 3 "steps" to get from 21 to 63 ___ each "step" is the same "distance"

the total "distance" is 42 (63 - 21) ___ each "step" is 42/3 or 14

21, 35, 49, 63

Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
63-21=42
42/3=14
.
21+14=35
35+14=49
.
Ed