take 23 2/3 and subtract 6 to get 53/3 or 17 2/3 or 17.667
then you take 17.667 and divide by 11 to get 1.606
$91/ 7 = $13 per dog
$117/$13 = 9 dogs
He washed 9 dogs
What you wanna do here is use a calculator, as "e" in mathematics refers to the "e" on a calculator. The tricky part about this question is that the answer for the equation is the given percentage, NOT the value for "x". From there, plug in the multiple choice answers for "x" and see which one works!
In this case, A is the correct answer. B is absurdly large, so I omitted it immediately in the attached picture.
Answer:
The answer is 1/9 and 1/2
1) 0.78
2) 34.28
This is because the number in the 3rd decimal place for both numbers is 5 or above so it is rounded up rather than down.