For a wire, first use two fifths of its total length, and then connect it with 27 meters. The current wire is one twentieth longer than the original one. How long is the original wire?

For a wire, first use two fifths of its total length, and then connect it with 27 meters. The current wire is one twentieth longer than the original one. How long is the original wire?

27 ÷ (1 / 20 + 2 / 5) = 60m