Discussion of Question with ID = 050 under Volume-and-Surface-Areas

This is the discussion forum for this question. If you find any mistakes in the solution, or if you have a better solution, then this is the right place to discuss. A healthy discussion helps all of us, so you are requested to be polite and soft, even if you disagree with the views of others. The question and its current solution has also been given on this page.



What is the length of a 10 mm wire that has been drawn out of a lump of 77 cu. cm. tin? Take π = 22/7.


2450 cm.


2452 cm.


2448 cm.


2454 cm.

Ans: a

The wire is a cylinder with r = 1/10 cm, and length L. The volume of tin is equal to the volume of the wire. So π ${1/10} × {1/10} × L$ = 77, which gives L = ${10 × 10 × 77 × 7}/22$ = 2450 cm.

Comments and Discussion