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OSTP Math Grade 7 Practice Questions - Oklahoma School Testing Program - Mathematics, Grade 7 Exam

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The table below shows a proportional relationship between hours worked ($x$) and total earnings in dollars ($y$): | Hours ($x$) | Earnings ($y$) | |---|---| | 3 | $45 | | 5 | $75 | | 8 | $120 | What is the constant of proportionality ($k = \frac{y}{x}$) in dollars per hour?
Correct Answer:
15

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