A bundle of wires takes two fifths of the total length, and the rest is 28 meters more than the one used. How long is the bundle of wires

A bundle of wires takes two fifths of the total length, and the rest is 28 meters more than the one used. How long is the bundle of wires

28 / (1-2 / 5-2 / 5) = 140 (m)