The Burkes pay their babysitter $5 per hour before 11 P. M. and $7.50 after 11 P. M. One evening they went out for 4 hr and paid the sitter $27.50. What time did they come home?

They came back home at 12 pm

Explanation:

Giving the following information:

The Burkes pay their babysitter $5 per hour before 11 P. M. and $7.50 after 11 P. M. One evening they went out for 4 hr and paid the sitter $27.50.

We need to formulate the total cost:

TC = 5*x + 7.5*y

x=5*4 = 20

y=7.5*1 = 7.5

TC = 5*4 + 7.5*1 = $27.5

They came back home at 12 pm