Experts do it fast

Dear Student,
Solution)
a) Length of rope = p metres
Number of pieces the rope is cut into = 5
Length of each piece = p/5

b) Length of each part = 4 metres 
Number of pieces of rope = 5
Total length of rope = 5 × 4 = 20 metres.
The total length of the rope is 20 metres.
Regards!