To find out how many inches of wire can be bought for 39 cents, we first need to determine the cost per inch of wire.
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Calculate the cost per inch: \[ \text{Cost per inch} = \frac{\text{Total cost}}{\text{Total inches}} = \frac{54 \text{ cents}}{18 \text{ inches}} = 3 \text{ cents per inch} \]
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Determine how many inches can be bought for 39 cents: To find out how many inches can be purchased for 39 cents, we divide the total amount of cents we want to spend by the cost per inch: \[ \text{Inches} = \frac{\text{Total amount}}{\text{Cost per inch}} = \frac{39 \text{ cents}}{3 \text{ cents per inch}} = 13 \text{ inches} \]
Thus, you can buy 13 inches of wire for 39 cents.