Question 1168001
Cost of one chocolate cookie = x
Cost of one butter cookie = 0.5x
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25x + 6 = 20x + 20(0.5x)
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25x + 6 = 20x + 10x
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25x + 6 = 30x
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5x = 6
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x = $1.20
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Since Bob originally had enough money to buy 25 chocolate cookies...and we know one chocolate cookie costs x dollars ($1.20)...that means 25 chocolate cookies cost $30.  So, Bob originally had $30.