Answer :
Final answer:
Debbie bought 4 pounds of tomatoes.
Explanation:
To find the number of pounds of tomatoes that Debbie bought, we need to set up an equation using the information given. Let's let x represent the number of pounds of tomatoes. The cost of the bananas can be calculated by multiplying the cost per pound by the number of pounds, which gives us 0.80 * (7 - x). The total cost is also given as $12.40. So we can set up the equation 0.80 * (7 - x) + 2.50 * x = 12.40. Simplifying this equation, we get 5.60 - 0.80x + 2.50x = 12.40. Combining like terms, we have 1.70x + 5.60 = 12.40. Subtracting 5.60 from both sides, we obtain 1.70x = 6.80. Dividing both sides by 1.70, we find that x = 4. So Debbie bought 4 pounds of tomatoes.
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