Explanation is in the file
tinyurl.com/wpazsebu
The system of equations of two unknowns is formulated and solved.




The fraction that satisfies the request is
, since in
the negative signs are canceled and the first fraction is obtained.
B determine the cost of 11 bags price
Answer: 24.5 or 25 1/2
-0.15 = -15/100 = -3/20
-7.75 = -7 3/4
-12.54 = -12 54/100 = -12 27/50