Chapter 4, Problem 1RE

To determine

The two unit ratios that relate feet and inches.

Answer to Problem 1RE

The unit ratios involving feet and inches are $\frac{1\text{ ft}}{12\text{ in}}$ and $\frac{12\text{ in}}{1\text{ ft}}$.

Explanation of Solution

Procedure used:

To write two equivalent measures as a unit ratio:

1. Write one measure in the numerator.

2. Write the equivalent measure in the denominator. The ratio has a value of 1.

Calculation:

The relationship between feet and inches is 1 feet contains 12 inches.

Thus, the unit ratios will be, $\frac{1\text{ ft}}{12\text{ in}}$ and $\frac{12\text{ in}}{1\text{ ft}}$.

Therefore, the unit ratios involving feet and inches are $\frac{1\text{ ft}}{12\text{ in}}$ and $\frac{12\text{ in}}{1\text{ ft}}$.