Do you want me to give an example of (x,y)?
Answer:
$2.50
Step-by-step explanation:
Let the original monthly expenses be 'x'.
Given:
Reduced monthly expenses = $2.125
Reduction in monthly expenses = 15%
Therefore, remaining percentage of monthly expenses = 100 - 15 = 85%
Now, as per question:

Therefore, the original monthly expenses of Mr. Wood was $2.50.
Also, we can find his monthly income using the value of 'x'.
As per question, his monthly expenses is 80% of his income.
So, 80% of income = 2.5
Income = 
So, his monthly income is $ 3.125
Angle 146 = angle2 .......[Corresponding angle]
Therefore, Angle 2 = 146
Now,
Angle 5 = angle2……………[vertically opposite angle]
Therefore, angle 5 = 146
The number would be 7 because you divide 42/6 and get a result of 7.