Maths-
General
Easy
Question
A rope makes 260 rounds of a cylinder with a base radius 20 cm. How many times can it go round a cylinder with a base radius 26cm?
Hint:
Hint:
Unitary method: The unitary method is a method in which we find the value of a unit and then the value of a required number of units. For example, If 10 apples cost is 100 rupees, 1 apple will cost 10 rupees and if we are asked to find the cost of 100 apples, we can find it by multiplying 100 with cost of 1 apple.
The correct answer is: 200 times
We are given that a rope makes 260 rounds of a cylinder with a base radius 20 cm.
Circumference of the cylinder with a radius of 20 cm = 2
R (R is the radius of the cylinder)
= 2 
20 = 40 cm
Length of rope = Circumference of the cylinder with a radius of 20 cm × Number of rounds
Length of rope = 40 × 260 = 10400 cm
We are asked the number of times the same rope can round a cylinder of a radius 26cm.
Number of rounds = 
= 
= 200 rounds
Final Answer:
Hence, the same rope can round 200 times a cylinder of a radius 26cm
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