With how many boxes did maria start with?

label Mathematics
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Maria bought seven boxes. A week later half of all her boxes were destroyed in a fire. There are now only 22 boxes left. with how many did she start?

Jun 1st, 2015

A week later half of all the boxes were destroyed in a fire. 
There are now only 22 boxes left. 
How many did she start with?
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Assume she had x boxes to start with.
After buying 7 she had x+7 boxes
She lost (1/2)(x+7) in the fire.
---
Equation:
x - (1/2)(x+7) = 22

x - (1/2)x - (7/2) = 22
(1/2)x - (7/2) = 22
(1/2)x = 51/2
x = 51 boxes



Jun 1st, 2015

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