Question

complete the ratio table.
18 17
36 34
54
72
90 85

Explanation:

Step1: Find the ratio

The ratio of first column to second column: $\frac{18}{17} = \frac{36}{34} = \frac{90}{85} = \frac{18}{17}$. So ratio is $18:17$.

Step2: Calculate for 54

Let the missing value be $x$. $\frac{54}{x} = \frac{18}{17}$. Cross multiply: $18x = 54×17$. $x = \frac{54×17}{18} = 3×17 = 51$.

Step3: Calculate for 72

Let the missing value be $y$. $\frac{72}{y} = \frac{18}{17}$. Cross multiply: $18y = 72×17$. $y = \frac{72×17}{18} = 4×17 = 68$.

Answer:

51, 68