Johnny is working on his math homework.  ~\uline{~~~~~~~~~~}~$$\div $$ $4$ = $9$ R $2$     The following is his solution:  $9\times2$ = $18$  $18+4=22$  Answer = $22$     Is his answer correct? If not, circle out his error and write out the correct working. 
Overseas Competition->Knowledge Point->Number Theory Modules->Remainder Problems->Questions involving Divisions with Remainders