Pauline billed her neighbor a total of $100 for the plumbing work she did. The cost of the materials was $12 and she charged $16 per hour for her service. How many hours did she work?
Let's start by subtracting the cost of materials from the total bill:
$100 - $12 = $88
Now we know that Pauline charged $16 per hour for her service, so we can use algebra to solve for the number of hours she worked:
$16/hour x hours worked = $88
To solve for hours worked, we need to isolate the variable by dividing both sides of the equation by $16:
hours worked = $88 / $16 per hour
hours worked = 5.5
Therefore, Pauline worked for 5.5 hours.
To find out how many hours Pauline worked, we need to first subtract the cost of materials from the total bill.
Total bill - Cost of materials = Cost of service
$100 - $12 = $88
Now, we know that Pauline charged $16 per hour for her service. To find out how many hours she worked, we can divide the cost of service by the cost per hour.
Cost of service / Cost per hour = Hours worked
$88 / $16 = 5.5 hours
So, Pauline worked for 5.5 hours.