Cereals

Ari and Joey share a 30-ounce box of cereal. By the end of the week, Ari has eaten 3/10 of the box, and Joey has eaten 3/5 of the box of cereal. How many ounces are left in the box?

Correct answer:

x =  3 oz

Step-by-step explanation:

$$\begin{gathered} m=30\text{oz} \\ k=1-\frac{3}{10}-\frac{3}{5}=\frac{1}{10}=0.1 \\ x=m\cdot k=30\cdot \frac{1}{10}=\frac{30\cdot 1}{10}=\frac{30}{10}=3\text{oz} \end{gathered}$$

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