Tanya is building a tower with blocks that are 3 inches high. Val is building a tower with blocks that are 7 inches high. What is the shortest tower each can build if they want their towers to be the same height? A. 14 inches B. 21 inches C. 35 inches D. 42 inches​

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Answer:

B. 21

Step-by-step explanation:

3x7= 21 they both have this multiple in common