Automobile Owners

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In a survey of 120 people, how many own an automobile?

(1) In the survey, the number of people who do not own an automobile is 2 times the number who do own an automobile.

(2) In the survey, the number of people who do not own an automobile is 40 more than the number who do own an automobile.

Review: Automobile Owners




Explanation

This question presents us with a simple situation. We can get the total number we are looking for, possibly from a ratio. Let's turn to the data statements, separately first.

Statement (1) tells us something that can be expressed in algebraic terms. If we call a is the number of people who own an automobile, we are told that . We have a. Sufficient.

Statement (2): by similar logic to above, we have . One linear equation with one variable means we can solve for a single value. Sufficient.

The correct answer is (D).


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