Question 571145
If {{{p}}}= principle
{{{ (3/5)*p }}} is invested @ 7%
{{{ (2/5)*p }}} is invested @ 3%
Note that {{{ (3/5)*p + (2/5)*p = p }}} 
as it should
given:
{{{ .07*.6*p + .03*.4*p = 54 }}} ( I used decimals instead of fractions )
{{{ .042p + .012p = 54 }}}
{{{ .054p = 54 }}}
{{{ p = 54/.054 }}}
{{{ p = 1000 }}}
{{{ (3/5)*1000 = 600 }}}
$600 was invested @ 7%
{{{ (2/5)*1000 = 400 }}}
$400 was invested @ 3%