Christie spent all of her savings during her five day vacation. Each day she...

[SabrinaB]

...spent twice as much as the day...? before. On the third day of her vacation,she spent $20. How much did she spend on her vacation?

 

[Megan]

$155

 

[sir2you]

Half of $20 is $10, so $10 was spent on the second day and $5 on the first day.

Five days total, so 5 + 10 + 20 + 40 + 80 = 155

She spent $155

I encourage you to try do this on your own. It's really simple and if you thought about it, you could have done it in less time than you took to post it here.