# Self

A math text book is 2 2/9 inches thick. how many of these books will fit on a 120-inch self?

Result

n =  54

#### Solution:

$n = \dfrac{ 120 }{ 2 \dfrac{ 2 }{ 9} } = \dfrac{ 120 }{ \dfrac{ 20 }{ 9} } \ \\ n = \dfrac{ 120 \cdot 9 }{ 20 } = 54$

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