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yatin kaushik

· started a discussion

· 1 Months ago

good question but badly put (Question: 269969.0 )

according to what your question says the right answer should be 24*15. There's nothing wrong in a good question but it should be rightly put so that students can understand.

Question:

A thread is wound on a cylinder such that it make exactly twenty-four complete turns around the cylinder. The two ends of thread touch the top and bottom of the cylinder. If the cylinder has a perimeter of 15 cm and its curved surface area is 2880 cm2, then find the length of the string.

Options:
A)

308 cm

B)

408 cm

C)

1612 cm

D)

1212 cm

Solution:

Ans: (b)

  

Chandraprakash

· commented

· 1 Months ago

thread are not one above other . they are spaced thats why height is 192.
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