Cost of goods sold - expenses = net income
do this for each year and compare.
The question gives the relationship to be

We will interpolate to solve the question.
First Question: 147 mi

Cross multiplying,
6x+12y-6z+7x7y-28z= 13x+19y-34z
Ronaldo has five times blancas amount
Juan has twice the amount
Plus blancas one times her amount that is 8 time blances amount. If Blanca has 1/8 of 500 then Juan has 1/4 and 1/4 of 500 is 125
Mathspapa.com ok find it there