Example: A coal class with $A=8$ and $M=39,$ was subjected to Dry$-$Free ultimate Analysis and the result obtained was:

$C=72\mathrm{.}4\%,H2=4\mathrm{.}7\%,O2=18\mathrm{.}6\%$

$N2=18\mathrm{.}6\%,S=2\mathrm{.}8\%,$

$1-$ Determine the as$-$received ultimate analysis.

$2-$ The HHV$.$

$3.$ The LHV$.$