Posted by anoynomous on Sunday, March 10, 2013 at 11:36pm.
The boy having a gold coin of diameter 2cm and thickess 2mm to a goldsmith for melting and drawing into a wire of diameter 1mm . the gold smith gave back a wire of gold of length 76cm with diameter 1mm. if the wastage allowed in melting could be a maximum of 5% of the total volume , does the godsmith man was honest or not

mathsmensuration  Steve, Monday, March 11, 2013 at 1:30am
If the smith was honest, you want
pi (.05)^2 * 76 >= 0.95 pi (1)^2 * .2
.19 >= .19
Looks like the smith was honest.

mathsmensuration  anoynomous, Monday, March 11, 2013 at 4:14am
from where .95 comes

mathsmensuration  Steve, Monday, March 11, 2013 at 10:29am
5% waste means at least 95% of the metal must be left after working on it.
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