Rose and

Rose and Bill share a 30-ounce bucket of clay. By the end of the week, Rose has used 1/10 of the bucket, and Bill has used 2/5 of the bucket of clay. How many ounces are left in the bucket?

Correct answer:

x =  15 oz

Step-by-step explanation:

$$\begin{gathered} m=30\text{oz} \\ a=\frac{1}{10}\cdot m=\frac{1}{10}\cdot 30=\frac{1\cdot 30}{10}=\frac{30}{10}=3\text{oz} \\ b=\frac{2}{5}\cdot m=\frac{2}{5}\cdot 30=\frac{2\cdot 30}{5}=\frac{60}{5}=12\text{oz} \\ x=m-a-b=30-3-12=15\text{oz} \end{gathered}$$

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