Question

A rope make 260 round of a cylinder with base radius 20 cm.how many times can it go round a cylinder with base radius 26 cm​

Answer 1

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Circumference of circular base of cylinder is 2πR.

Total length of the rope =n(2πR) , where n is number of revolutions 

Since length will remain constant

n1(2πR1) = n2(2πR2)

n1=260 , n2=?, R1=20cm and R2=26 cm

260×20=26×n2

n2=200