Respuesta :
Answer: Board is 357 cm long.
Step-by-step explanation:
Since we have given that
Suzanna wants to measure a board but she doesn't have a ruler to measure with,So she has several copies of a book that she knows is 17 cm tall where She lays the books end to end to find the length of board which is the same Ā length as Ā 21 books.
So,
Number of books = 21
Length of board of each book = 17 cm
According to question, we need to find the length of board for 21 books:
Length of board is given by
[tex]21\times 17\\\\=357\ cm[/tex]
Hence, Board is 357 cm long.