SOLUTION: Please help me solve this story problem: Tammy earned a total of $210 over 3 days. Each day she earned twice as much as she did on the previous day. How much did she earn on e

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Question 268665: Please help me solve this story problem:
Tammy earned a total of $210 over 3 days. Each day she earned twice as much as she did on the previous day. How much did she earn on each of the 3 days?
I tried dividing by three and finding a number to double but came out wrong, and I don't want the last day to earn $210, I'm stuck! Thank you
Found 2 solutions by drk, stanbon:
Answer by drk(1908) (Show Source):
You can put this solution on YOUR website!
Let day 1 = d, day 2 = 2d,and day 3 = 4d
So, we get

step 1 - combine like terms to get

step 2 - divide to get

day 1 = 30
day 2 = 60
day 3 = 120

Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website!
Tammy earned a total of $210 over 3 days.
Each day she earned twice as much as she did on the previous day.
How much did she earn on each of the 3 days?
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Let "x" be amount earned on day one
2x is the amount earned on day two
4x is amount earned on day three
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Equation:
x + 2x + 4x = 210
7x = 210
x = 30 (1st day
2x = 60 (2nd day
6x = 120 (3rd day
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Cheers,
Stan H.

I tried dividing by three and finding a number to double but came out wrong, and I don't want the last day to earn $210, I'm stuck!