Q: four fifths of a wire is used, and the rest is 27 meters less than the one used. How many meters is the total length of this wire? Come on, I really can't think of it

Q: four fifths of a wire is used, and the rest is 27 meters less than the one used. How many meters is the total length of this wire? Come on, I really can't think of it

4/5-1/5=27
3/5=27
1/5=9
5*9=45