Question 679614
Let {{{ x }}} = pounds of fertilizer to start with
After 1st day, there is 
{{{ x - (2/5)*x = (3/5)*x }}} left
After 2nd day, there is
{{{ (3/5)*x - (3/4)*(3/5)*x = (3/5)*x*( 1 - 3/4 ) }}}
{{{ (1/4)*(3/5)*x }}} left
You are given that
{{{ ( 3/20 )*x = 1200 }}}
{{{ 3x = 24000 }}}
{{{ x = 8000 }}}
There were 8000 pounds of fertilizer to start with