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30-09-2020
Mathematics

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A plumber charges $30 an hour plus cost of parts. The parts to fix Ben's sink cost $97. The plumber gives Ben a bill for $217. How long did it take the plumber to fix Ben's sink?

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30-09-2020

Answer:

4 hours

Step-by-step explanation:

Write an equation:

30x+97=217

Subtract 97 on both sides

30x=120

divide 30 on both sides to isolate the variable

x=4

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