Lizzy: Hannah wants to save $80 for five weeks. In the first week, she saved $4 and she plans to save twice as much as her savings as the previous week. How much will she save in the fifth week to reach her goal?.
Me: Hmmm, let me think. I think this is the detailed solution:
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In the second week, Hannah will save $4 x 2 = $8. In the third week, she will save $8 x 2 = $16. In the fourth week, she will save $16 x 2 = $32. Her total savings for a month will be $4 + $8 + $16 + $32 = $60. Hannah needs to save $80 - $60 = $20 in the fifth week. Final answer: 20.
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