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Suzanna wants to measure a board, but she doesn't have a ruler to measure it. However, she does have several copies of a book she knows is 17 centimeters tall.

A: Suzanna lays the books end to end and finds that the board is the same length as 21 books. How many centimeters long is the board?

B: Suzanna needs a board that is at least 3.5 meters long. Is the board long enough? Explain.

Sagot :

Aisin

Every book is 17 centimeters tall/long.

A : If the board is the same length as 21 books, its length is 17 x 21 = 357 centimeters.

B : 357 centimeters = 3.57 meters

Since 3.57 > 3.5, the board is long enough.