Posted by Ashli on Wednesday, December 12, 2012 at 10:54pm.
Let the amount each had initially be x.
x - 18 = 2*(x - 25) = 2x - 50
x = 32
Here is your bar model:
This is a unit bar: [xxx]
Before - the had equal amounts, then they each spent some money. In the end, Lily has twice as much as Sara, or 2 units.
Lily [xxx][xxx]<----$18---->|
Sara [xxx]<-----$25-------->|
If they started out the same, the second unit bar for Lily must be equal to $25 - $18, so $7
[xxx]=$7
Lily had 2 units (2 x $7)+$18 at first.
Sara had 1 unit ($7)+$25 at first.
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