Arelli

Arelli had 20 minutes to do a three-problem quiz. She spent 9 7/10 minutes on question A and 3 2/5 minutes on question B. How much time did she have left for question C?
Solve on paper to find the answer as a fraction.

Correct result:

c =  6.9 min

Solution:

$$\begin{gathered} t=20\text{ min } \\ a=9{\displaystyle \frac{7}{10}}={\displaystyle \frac{9\cdot 10+7}{10}}={\displaystyle \frac{97}{10}}=9.7\text{ min } \\ b=3{\displaystyle \frac{2}{5}}={\displaystyle \frac{3\cdot 5+2}{5}}={\displaystyle \frac{17}{5}}=3.4\text{ min } \\ c=t-a-b=20-9.7-3.4={\displaystyle \frac{69}{10}}={\displaystyle \frac{69}{10}}\text{ min}=6.9\text{ min} \end{gathered}$$

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