Answer:
Bailey family's sprinkler was used for 35 hours and Harris family's sprinkler was used for 20 hours.
Step-by-step explanation:
Set up a system of equations.
Let be "b" the time Bailey family's sprinkler was used and "h" the time Harris family's sprinkler was used.
Then:

You can use the Elimination method. Multiply the first equation by -15, then add both equations and solve for "h":

Substitute
into an original equation and solve for "b":

The answer is 168. 12% is also 0.12. 150(0.12) is 18. 150+18=168
A because if you multiply 50,000 by .10 (10%) you'll get 5,000
Solving the equation we get:

Step-by-step explanation:
We need to solve the equation: 
Solving:


Taking LCM of 9 and 4 we get 36




So, solving the equation
we get 
In the first blank, in denominators we get 36 and in the second black we get 
So, answer is:

Keywords: Solving Fractions
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