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 = 2R (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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