Question 511329
You can say
Let {{{ p }}} = number of pecans
Let {{{ b }}} = number of Brazil nuts
Let {{{ w }}} = number of walnuts
given:
(1) {{{ p = 3b }}}
(2) {{{ w = b + 1 }}}
(3) {{{ p + b + w = 6 }}}
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There are 3 equations and 3 unknowns, so
this is solvable.
It's not easy going from the words to the equation.
I still get confused sometimes, so keep working at it.