[tex] \frac{ x_{1} + x_{2}+ x_{3}+...+ x_{11} }{11}=22 [/tex]
[tex] x_{1}+ x_{2}+ x_{3}+...+ x_{11}=11*22=242 [/tex]
[tex] \frac{ x_{1}+ x_{2}+ x_{3}+...+ x_{10} }{10}=21 [/tex]
[tex] x_{1}+ x_{2}+ x_{3}+...+ x_{10}=10*21=210 [/tex]
[tex] (x_{1}+ x_{2}+ x_{3}+...+ x_{11})-( x_{1}+ x_{2}+ x_{3}+...+ x_{10})=242-210 [/tex]
[tex] x_{11}=242-210 [/tex]
[tex] x_{11}=32 [/tex]