Problem
4) Mr. Tanaka is making Miso soup for his family. The recipe calls for \( 350 \mathrm{~mL} \) of Dashi. Mr. Tanaka plans to make a smaller batch using \( 280 \mathrm{~mL} \) of Dashi. He wants to know what percent of the stock he will use compared to the original recipe. Find an equivalent ratio where the amount of stock is \( 100 \mathrm{~mL} \). \begin{tabular}{|c|c|c|} \hline Stock Mr. Tanaka Used (mL) & 280 & 80 \\ \hline Stock in Recipe (mL) & 350 & 100 \\ \hline \end{tabular} (1)) What percent of the stock did Mr. Tanaka use? (1)) Mr. Tanaka used \( \% \) of the stock in the recipe.
Solution
Step 1 ：\frac{280}{350} = \frac{x}{100}
Step 2 ：\frac{280}{350} = \frac{80}{100}
Step 3 ：x = 80
