Question 550658
Let {{{ b }}} = number of bass
Let {{{ p }}} = number of perch
given:
(1) {{{ b + p = 10000 }}}
(2) {{{ 3b + 2p = 22000 }}}
-----------------
Multiply both sides of (1) by {{{2}}} 
and subtract (1) from (2)
(2) {{{ 3b + 2p = 22000 }}}
(1) {{{ -2b - 2p = 20000 }}}
{{{ b = 2000 }}}
and, from (1)
(1) {{{ 2000 + p = 10000 }}}
(1) {{{ p = 8000 }}}
There are 2,000 bass and 8,000 perch