Problem 19

$$\begin{array}{lcl} 19.\: The\:average\:of \:a\:set\:of\:10\:different\:numbers \:is\:130.\\ If\:the\:numbers\:100\:and\:120\:are\:removed \:from \: the \:set,\\ what\:is\: the\:average\:of\:the\:remaining\:numbers\:? \\ \\ \end{array}$$