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Bookwork code: K63
The table below shows the numbers of pike and carp in three different lakes.

For each lake, write the ratio of pike to carp in the form $1: n$.

Put the lakes in ascending order based on the proportion of fish that are carp.
\begin{tabular}{|c|c|c|}
\hline & Pike & Carp \\
\hline Lake A & 15 & 42 \\
\hline Lake B & 9 & 30 \\
\hline Lake C & 40 & 8 \\
\hline
\end{tabular}
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Answer ?

Step 1 ：Find the ratio of pike to carp for each lake in the form 1:n: \(\frac{15}{42} = 1: \frac{42}{15} = 1:2.8\) for Lake A, \(\frac{9}{30} = 1: \frac{30}{9} = 1:3.33\) for Lake B, and \(\frac{40}{8} = 1: \frac{8}{40} = 1:0.2\) for Lake C

Step 2 ：Calculate the proportion of fish that are carp for each lake: \(\frac{42}{57} = 0.737\) for Lake A, \(\frac{30}{39} = 0.769\) for Lake B, and \(\frac{8}{48} = 0.167\) for Lake C

Step 3 ：Sort the lakes in ascending order based on the proportion of fish that are carp: Lake C (0.167), Lake A (0.737), Lake B (0.769)

Step 4 ：\boxed{\text{Final Answer: Ratios - Lake A: 1:2.8, Lake B: 1:3.33, Lake C: 1:0.2; Order - Lake C, Lake A, Lake B}}