28/57*100=49% I would like to think that is the correct procedure and answer
Answer:
A
Step-by-step explanation:
Refer to the picture above.
Explainations are written in the pic above.
Multiply everything in the parenthesis by a.
ac + ab = d
Subtract ab from both sides.
ac = d - ab
Divide a on both sides.
c = d - ab / a
Hope this helps!