SOLUTION: In the sequence of #'s x1, x2, x3, x4, x5 (all numbers are sub), each # after the first is twice the preceeding number. If x5 - x1 = 20, what is the value of x1?

SOLUTION: In the sequence of #'s x1, x2, x3, x4, x5 (all numbers are sub), each # after the first is twice the preceeding number. If x5 - x1 = 20, what is the value of x1?

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Question 321690: In the sequence of #'s x1, x2, x3, x4, x5 (all numbers are sub), each # after the first is twice the preceeding number. If x5 - x1 = 20, what is the value of x1?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!

Since

and

, we can say

.

Following this reasoning, we end up with

John

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