To determine how many bags of popcorn Damari needs to sell to reach his goal of $85, we can set up the equation as follows:
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He already has $40.
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His goal is $85.
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Therefore, the amount of money he needs to earn from selling popcorn is: \[ 85 - 40 = 45 \text{ dollars} \]
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Since each bag of popcorn sells for $3, we can find the number of bags he needs to sell by dividing the amount he needs to earn by the price per bag: \[ \text{Number of bags} = \frac{45}{3} = 15 \]
So, Damari needs to sell 15 bags of popcorn to reach his goal of $85.