Suppose you wanted to line up all the people in the world. (The world's population is about 6.8 billion.) Assuming that each person takes up 12 inches of the line, how many times around Earth would they reach? (Earth has a circumference of about 25,000 miles.) Round you answer to the nearest tenth.
A)92.1
B)53.0
C)51.5
D)68.2

Question

Quizplus · Accepted Answer

To find the total length of the line, we can multiply the number of people by the length each person takes up:

6.8 billion x 12 inches/person = 81.6 billion inches

To convert this into miles, we can divide by the number of inches in a mile:

81.6 billion inches ÷ 63,360 inches/mile = 1,287,878.79 miles

So if we lined up all the people in the world, they would reach around Earth about 1.3 million times. Rounded to the nearest tenth, this is 51.5 times (since 1.3 million is very close to 51.5 x 25,000 miles). Therefore, the correct answer is C.

Suppose You Wanted to Line Up All the People in the World