If three inches of rope cost 7 cents, how much would 2 feet of rope cost?

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Multiple Choice

If three inches of rope cost 7 cents, how much would 2 feet of rope cost?

Explanation:
This question tests how cost scales with length using a constant price per unit. If 3 inches cost 7 cents, the price per inch is 7/3 cents. A length of 2 feet is 24 inches, so the total cost is 24 inches times 7/3 cents per inch, which equals (24/3) × 7 = 8 × 7 = 56 cents. The cost grows in direct proportion to the amount of rope, so longer lengths cost more in the same ratio.

This question tests how cost scales with length using a constant price per unit. If 3 inches cost 7 cents, the price per inch is 7/3 cents. A length of 2 feet is 24 inches, so the total cost is 24 inches times 7/3 cents per inch, which equals (24/3) × 7 = 8 × 7 = 56 cents. The cost grows in direct proportion to the amount of rope, so longer lengths cost more in the same ratio.

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