Triangle $JKL$ is similar to triangle $MNO$ such that $J,K,$ and $L$ correspond to $M,N,$ and $O$, respectively. The measure of $\angle K$ is $(2x+10{)}^{\circ }$ and the measure of $\angle N$ is $(3x-5{)}^{\circ }$. If $JK=2MN$, what is the measure of $\angle K$?