The cost of toothpaste is $6.00 for 3 tubes. At this rate, how much do 12 tubes of toothpaste cost?

Three tubes cost $6.00, so each tube costs $6.00 ÷ 3 = $2.00. For 12 tubes, the cost is 12 × $2.00 = $24.00. The correct choice is B, $24.00.

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