Chapter 0.4, Problem 41E

To determine

To calculate: The amount of Earth’s surface is covered by land.

Answer to Problem 41E

  $\frac{3}{10}$ of Earth’s surface is covered by land.

Explanation of Solution

Given information:

About $\frac{7}{10}$ of Earth’s surface is covered by water.

Formula used:

If a complete circle is divided into two parts and if proportion of one part is x then the proportion of second part is 1-x.

Consider the provided statement “about $\frac{7}{10}$ of Earth’s surface is covered by land.”

Recall that if a complete circle is divided into two parts and if proportion of one part is x then the proportion of second part is 1-x.

Here, Earth represents the one circle which is divided into two parts i.e., land and water. The proportion of water is given as $\frac{7}{10}$ .

So, Earth’s surface covered by land is,

  $\begin{array}{c}1-\frac{7}{10}=\frac{10-7}{10}\\ =\frac{3}{10}\end{array}$

Hence, $\frac{3}{10}$ of Earth’s surface is covered by land.