Martha

Martha likes to walk in the park, the park is square, 7/10 mi on each side. One morning Martha walked around the entire park 3 1/2 times before stopping to rest. How far had she walked?

Correct result:

x =  9.8 mi

Solution:

$$\begin{gathered} a=7\mathrm{/}10={\displaystyle \frac{7}{10}}=0.7\text{ mi } \\ o=4\cdot a=4\cdot 0.7={\displaystyle \frac{14}{5}}=2\frac{4}{5}=2.8\text{ mi } \\ k=3+{\displaystyle \frac{1}{2}}={\displaystyle \frac{7}{2}}=3\frac{1}{2}=3.5 \\ x=k\cdot o=3.5\cdot 2.8={\displaystyle \frac{49}{5}}=9\frac{4}{5}={\displaystyle \frac{49}{5}}\text{ mi}=9.8\text{ mi} \end{gathered}$$

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