Question 727759
{{{ 4/5 - 1/3 }}} is the time listening to classical
{{{ ( 4/5 )*( 3/3 ) }}} is still {{{ 4/5 }}}  -no change
{{{ ( 1/3 )*( 5/5 ) }}} is still {{{ 1/3 }}}  -no change
{{{ ( 4/5)*( 3/3 ) - ( 1/3 )*( 5/5 ) }}}
{{{ 12/15 - 5/15 }}}
{{{ 7/15 }}} is the number of hours listening to classical