Coefficient of hardness calculated from Dorry Abrasion Test is given as ____
1
\(40- \frac{{Loss\;of\;the\;weight\;in\;gms}}{3}\)
2
\(40- \frac{{Loss\;of\;the\;weight\;in\;milligrams}}{{300}}\)
3
\(20 - \frac{{Loss\;of\;the\;weight\;in\;gms}}{3}\)
4
\(20 - \frac{{Loss\;of\;the\;weight\;in\;milligrams}}{{300}}\)