Calculate the alkalinity of a water source at $pH10$ with $40m\frac{g}{L}HC{O}_3^{-}$and $25\mathrm{.}0m\frac{g}{L}C{O}_3^{2-}.$ Express your answer in $m\frac{g}{L}$ as $CaC{O}_3$ and round to the nearest $0\mathrm{.}1.$