Wouldn't it be -1 (minus one)? 12 - 1 = 11 and 9 - 1 = 8.
Of each ones place.... Or ... The sum of each number? Just trying to help.....
When you simply the expression it’s 16
<u>Answer:</u>
$50 and $115
<u>Step-by-step explanation:</u>
We know that,
the sum of the two rates = $165 per hour
Let x and (165 - x) represent the $/hour of the 15hr and 5hr mechanics respectively.
Then combining their charges together to get:

Solving for x to get:



So the rate charged per hour by one mechanic is $50 and for the other mechanic =
$115.