Picture frames

Destiny has to make 24 picture frames. Each frame uses 16 3/8 wood trim. 2/3 were completed on the first day. How many inches of wood trim is needed to complete the remaining frames on the second day?

Correct result:

x =  131 inch

Solution:

$$\begin{gathered} a=16+{\displaystyle \frac{3}{8}}={\displaystyle \frac{131}{8}}=16.375\text{ inch } \\ n=24 \\ {n}_2=(1-{\displaystyle \frac{2}{3}})\cdot n=(1-{\displaystyle \frac{2}{3}})\cdot 24=8 \\ x=n_2\cdot a=8\cdot 16.375=131\text{ inch} \end{gathered}$$

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