To determine how many paints Lucia bought, we can start by calculating how much she spent on the paints after purchasing the canvas.
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Lucia's total spending is $38.
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The cost of the canvas is $20.
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The amount spent on paints is: \[ 38 - 20 = 18 \text{ dollars} \]
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Each paint costs $3. To find out how many paints she bought, we divide the amount spent on paints by the cost of each paint: \[ \frac{18}{3} = 6 \]
Thus, Lucia bought 6 paints.