They packed books in the library. They used 45 cm of wrapping paper per book. Wrapping papers are sold in rolls of 3 meters. How many such roles do they need to wrap 20 books?

Correct answer:

n =  3

Step-by-step explanation:

a=45 cm m=45:100  m=0.45 m b=3 m  n0=b20 a=320 209=3  n=n0=3=3

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