Question 850348
Let {{{ x }}} = the fraction that were different
{{{ 1/3 + 1/4 + 1/5 + x = 1 }}}
Multiply both sides by {{{ 60 }}}
{{{ 20 + 15 + 12 + 60x = 60 }}}
{{{ 47 + 60x = 60 }}}
{{{ 60x = 13 }}}
{{{ x = 13/60 }}}
{{{ ( 13/60)*60 = 13 }}}
13 cars were different