Rose spends

Rose spends 2 1/3 hours studying Math, 1 3/4 hours studying English, and 2 1/4 hours studying Science. Find her average time studying the three subjects.

Correct result:

m =  2.1111 h

Solution:

$$\begin{gathered} a=2{\displaystyle \frac{1}{3}}={\displaystyle \frac{2\cdot 3+1}{3}}={\displaystyle \frac{7}{3}}\doteq 2.3333\text{ h } \\ b=1{\displaystyle \frac{3}{4}}={\displaystyle \frac{1\cdot 4+3}{4}}={\displaystyle \frac{7}{4}}=1.75\text{ h } \\ c=2{\displaystyle \frac{1}{4}}={\displaystyle \frac{2\cdot 4+1}{4}}={\displaystyle \frac{9}{4}}=2.25\text{ h } \\ m={\displaystyle \frac{a+b+c}{3}}={\displaystyle \frac{2.3333+1.75+2.25}{3}}={\displaystyle \frac{19}{9}}=2.1111\text{ h} \end{gathered}$$

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