Question

The Ecology Club was planning to take a field trip either to the seacoast or the mountains. The club president surveyed all of the members to determine the preferred trip. The results are displayed in the table below. Which statement is true about the results of the survey?

A. 20% of eighth-grade students preferred the seacoast

B. 32% of seventh-grade students preferred the mountains

C. 40% of students preferred the mountains

D. 48% of students preferred the seacoast

Answer 1

The statement true about the results of the survey is:

• D. 48% of students preferred the seacoast.

Explanation:

To identify if the D option is right, you only must use a simple rule of three, where you use the total of the members surveyed in the club (150), and the number of members that preferred the seacoast (72), by the last the operation must confirm that this value (72) is equal to the 48% (how says in the D option). First, you must establish the rule of three:

• 150 = 100 (100% of surveyed really, but is easier to understand in this form)
• 72 = X

And operate:

• X= (72 * 100) / 150
• X = 48 (this means the 48%)

How you can see, the value obtained in the simple rule of three is exactly the percentage of the D option, for this reason, this is the true statement.