Mushroom risotto

630g of rice is needed to prepare mushroom risotto for four people. How many boxes of 500g rice do you have to buy to prepare risotto for 17 people?

Final Answer:

n =  6

Step-by-step explanation:

$$\begin{gathered} m_4=630\text{g} \\ {m}_{17}=\frac{17}{4}\cdot m_4=\frac{17}{4}\cdot 630=\frac{17\cdot 630}{4}=\frac{10710}{4}=\frac{5355}{2}=2677\frac{1}{2}=2677.5\text{g} \\ {m}_1=500\text{g} \\ {n}_1=m_{17}/m_1=\frac{5355}{2}/500=\frac{5355}{2\cdot 500}=\frac{5355}{1000}=\frac{1071}{200}=5\frac{71}{200}=5.355 \\ n=\lceil n_1\rceil =\lceil 5.355\rceil =6 \end{gathered}$$

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