The length of copper wire is 2.1 meters, and that of aluminum wire is 1.6 meters. Subtract the same length from the two wires, so that the length of copper wire is twice that of aluminum wire. How many meters are the two wires reduced? If the title, seek the process! Urgent! Good answer, please add equation! Thank you!

The length of copper wire is 2.1 meters, and that of aluminum wire is 1.6 meters. Subtract the same length from the two wires, so that the length of copper wire is twice that of aluminum wire. How many meters are the two wires reduced? If the title, seek the process! Urgent! Good answer, please add equation! Thank you!

Answer: minus 1.1 meters
Solution: (I won't talk about the problem of equations)
At the beginning, the copper wire is 0.5m longer than the aluminum wire, because the same length is subtracted, so the difference is unchanged. Then when the length of the copper wire is the length of two aluminum wires, the difference between the copper wire and the aluminum wire is the length of the aluminum wire, which is 0.5m, and the copper wire is 1m, so 1.1m is subtracted

All sizes of copper wire
It's the size of the tangent area

1,1.5,2.5,4,6,10,16,25,35,50,70,95,120,150,185,240,300,400,500,630...