complete the ratio table.\n9 4\n18 \n27 12\n36 16\n45 20

Explanation:

Step1: Find the ratio of the first column to the second column.

We can see that $\frac{9}{4}$, $\frac{27}{12}=\frac{9}{4}$, $\frac{36}{16}=\frac{9}{4}$, $\frac{45}{20}=\frac{9}{4}$. So the ratio between the first number and the second number in each row is $\frac{9}{4}$.

Step2: Let the unknown number be $x$. We know that $\frac{18}{x}=\frac{9}{4}$. Cross - multiply to get $9x = 18\times4$.

First, calculate $18\times4 = 72$. Then, solve for $x$: $x=\frac{72}{9}=8$.

Answer:

8