Set 1: Linear Equations (Advanced)

Explanation

Answer: D

A plumber charges $75 for a service call plus$ 60 per hour of labor. If the total bill was $255, how many hours did the plumber work?

How many hours of labor were charged?

✓ Correct

Detailed Explanation

Choice D is correct. Set up the equation: 75 + 60 h = 255. Subtract 75: 60 h = 180. Divide by 60: h = 3.

Key Steps:

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The correct answer is 3

Why others are wrong:

A: Choice A is incorrect and may result from a calculation error.

B: Choice B is incorrect and may result from a calculation error.

C: Choice C is incorrect and may result from a calculation error.

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