If equal masses of 10 liquids of specific heats $\mathrm{s}, 2 \mathrm{~s}, 3 \mathrm{~s}, \ldots \ldots \ldots 10 \mathrm{~s}$ at temperatures $10^{\circ} \mathrm{C}, 20^{\circ} \mathrm{C}, 30^{\circ} \mathrm{C}, \ldots \ldots 100^{\circ} \mathrm{C}$ respectively are mixed, the resultant temperature of the mixture is _________ .