Multiple choice

A rope makes 70 rounds of the circumference of a cylinder whose radius of the base is 14 cm. How many times can it go round a cylinder with radius 20 cm ?

  1. 40

  2. 49

  3. 100

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
AI explanation

The total length of the rope is found by multiplying 70 rounds by the circumference of the first cylinder, 2 * pi * 14, which equals 1960 * pi. To find how many times it goes around the second cylinder, divide this total length by its circumference, 2 * pi * 20. This gives (1960 * pi) / (40 * pi), which simplifies to 49.

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