Blue silk

There are four rolls of blue silk. Each roll holds 6 3/4 yd of silk. It takes 3/5 of a yard to make one necktie. How many neckties can be made from the four rolls of blue silk?

Correct answer:

n =  45

Step-by-step explanation:

$$\begin{gathered} s=4\cdot 6\frac{3}{4}=4\cdot \frac{27}{4}=\frac{4\cdot 27}{4}=\frac{108}{4}=27\text{yd} \\ o=3/5=\frac{3}{5}=0.6\text{yd} \\ n=s/o=27/\frac{3}{5}=27:\frac{3}{5}=27\cdot \frac{5}{3}=\frac{27\cdot 5}{3}=\frac{135}{3}=45 \end{gathered}$$

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