Question 128737
Number of novels: n
Number of biographies: b
Number of mysteries: m


Givens:
{{{n = 25}}}
{{{n=2b+3}}}, if there were twice as many novels as biographies, then {{{n = 2b}}}, but there are three more than that so {{{n=2b+3}}}
{{{m=3n-1}}}, similar logic


We can substitute 25 for n directly, so:


{{{25=2b+3}}} and {{{m=3(25)-1}}}


{{{m=3(25)-1}}}
{{{m=74}}}


{{{25=2b+3}}}
{{{22=2b}}}
{{{b=11}}}


So, we have a total of {{{25 + 11 + 74 = 110}}} books


{{{11/110=1/10}}} are biographies.