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Indresh Gehalot • 10.11K Points
Tutor II Math 

Q. A rope can make 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 having radius 20 cm?

  • (A) 49 rounds
  • (B) 54 rounds
  • (C) 56 rounds
  • (D) 77 rounds
Correct Answer - Option(A)
Explanation by: Indresh Gehalot 
Given in the question,
If radius is 14 cm then rope can make 70 rounds.
If radius is 1 cm then rope can make 70 x 14 rounds.
If radius is 20 cm then rope can make 70 x 14 / 20 rounds.
If radius is 20 cm then rope can make 7 x 7 rounds.
If radius is 20 cm then rope can make 49 rounds.

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