Question 1012910
Let {{{ n }}} = the number of one-way trips
taken in a month with a pass
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When is {{{ 27/n }}} less than {{{ .75n }}} ?
{{{ 27/n < .75n }}}
Multiply both sides by {{{ n }}}
{{{ .75n^2 > 27 }}}
( note that I just rewrote the inequality 
from right to left )
Divide both sides by {{{ .75 }}}
{{{ n^2 > 36 }}}
{{{ n > 6 }}}
At least 7 one-way trips must be taken 
for the pass to be a better deal
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check:
{{{ .75n = .75*7 }}}
{{{ .75n = 5.25 }}}
and
{{{ 27/n = 27/7 }}}
{{{ 27/n = 3.86 }}}
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And, trying {{{ n=6 }}},
{{{ .75n = .75*6 }}}
{{{ .75n = 4.5 }}}
and
{{{ 27/n = 27/6 }}}
{{{ 27/n = 4.5 }}}
Costs are the same
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OK