Self

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

Correct answer:

n =  54

Step-by-step explanation:

$$\begin{gathered} n={\displaystyle \frac{120}{2{\displaystyle \frac{2}{9}}}}={\displaystyle \frac{120}{{\displaystyle \frac{20}{9}}}} \\ n={\displaystyle \frac{120\cdot 9}{20}}=54 \end{gathered}$$

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