Lori can do 42 push-ups. This is ten less than twice the amount of push-ups her sister can do. How many push-ups can her sister
2 answers:
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<h2>Hello!</h2>
The answers is:
The first mechanic's rate is $70 per hour.
The second mechanic's rate is $110 per hour.
<h2>Why?</h2>Let's write the given information in order to make the equations that will help us to solve this problem.
Let be "x" the first mechanic's rate and "y" the second mechanic's rate, so:
If the first mechanic worked for 5 hours and the second mechanic worked for 15 hours, and the together charged a total of $2000.
Also, we know that the sum of the two rates was $170 per hour, so:
Then, isolating "x" and replacing it into the first equation, we have:
So, the second mechanic's rate is $110 per hour.
Now, to calculate the first mechanic's rate we need to replace "y" into the second equation:
So, the first mechanic's rate is $70 per hour.
Have a nice day!