Aplumber and his assistant work together to replace the pipes in an old house. the plumber charges $40 an hour for his own labor and $15 an hour for his assistant's labor. the plumber works twice as long as his assistant on this job, and the labor charge on the final bill is $3325. how long did the plumber and his assistant work on this job

The plumber worked 70 hours and his assistant 35 hours.

Explanation:

To solve this problem, we will use the substitution method. Step by step explanation:

1. Defining the variables:

2. Defining the equations:

3. Replacing P in equation 2:

4. Replacing A in equation 1 to find the value of P:

This means the plumber worked 70 hours and his assistant 35 hours for a final bill of $3325.

answer; common market;

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