SAT Linear equations in two variables Practice Question 8 (Medium)

Question bank / Linear equations in two variables

Math · AlgebraMedium

Dana earns $\$15$ per hour at her first job and $\$20$ per hour at her second job. Last month she earned a total of $\$600$ from the two jobs. If she worked $12$ hours at her second job, how many hours did she work at her first job?

$16$

$24$

$28$

$40$

Show answer and explanation

Answer: B

Let $h$ be hours at the first job: $15h + 20(12) = 600$ . Then $15h + 240 = 600$ , so $15h = 360$ and $h = 24$ .

Choice D divides 600 by 15, ignoring the earnings from the second job.

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