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?

Answer 1

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.