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How to do the last question of the primary school mathematics test paper in sixth grade?
Suppose the length of the rope is x.

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!