Chapter 7.1, Problem 7CE

(a)

To determine

Find the ratio of water to oatmeal.

Answer to Problem 7CE

The ratio of water to oatmeal is $3:2$ .

Explanation of Solution

Given information:

For making oatmeal, use 3 cups of water with 2 cups of oatmeal.

Calculation:

Ratio of two numbers is a quotient when a number is divided by other.

Consider the instructions to make oatmeal, use 3 cups of water with 2 cups of oatmeal.

Find the ratio of water to oatmeal.

  $\begin{array}{c}Ratio=\frac{Numberofcupofwater}{Numberofcupofoatmeal}\\ =\frac{3}{2}\end{array}$

Hence, the ratio of water to oatmeal is $3:2$ .

(b)

To determine

To find the number of cups of water required if Barbara uses 6 cups of water.

Answer to Problem 7CE

  $4$ cups of oatmeal are required to make breakfast.

Explanation of Solution

Given information:

For making oatmeal, use 3 cups of water with 2 cups of oatmeal.

Calculation:

Ratio of two numbers is a quotient when a number is divided by other.

We need to use 3 cups of water with 2 cups of oatmeal.

Consider 6 cups of water instead of 3.

Let the number of cups of oatmeal be $x$ .

We can find the number of cups of water using ratios:

  $\begin{array}{c}\frac{3}{2}=\frac{Numberofcupofwater}{Numberofcupofoatmeal}\\ \frac{3}{2}=\frac{6}{x}\end{array}$

Use cross multiplication.

  $\begin{array}{c}\frac{3}{2}=\frac{6}{x}\\ 3x=12\\ x=\frac{12}{3}\\ x=4\end{array}$

Hence, the number of cups of oatmeal required to make breakfast is $4$ .