Eight pipes

Eight pipes are each 2¼m long . what is the total length of the eight pipes?

Correct answer:

x =  18 m

Step-by-step explanation:

$$\begin{gathered} a=2{\displaystyle \frac{1}{4}}=2+{\displaystyle \frac{1}{4}}={\displaystyle \frac{2\cdot 4+1}{4}}={\displaystyle \frac{9}{4}}=2.25\text{ m } \\ n=8 \\ x=n\cdot a=8\cdot 2.25=18\text{ m} \end{gathered}$$

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