Use (1/3)X for the rope, leaving (2/3)X,?
Connection 16m, (2/3)X+ 16.
Longer than before 1/5? ,(2/3)X+ 16-? X=( 1/5)X
Solve the linear equation of one variable and get the answer: x? =? 30
The specific steps are shown in the figure!
I hope you can understand! Ha ha!