Question 547083
Let {{{x}}} = number of oranges bought
{{{x}}} also is number of bananas bought
{{{ 5x }}} = cost of oranges
{{{ 2x }}} = cost of bananas
At the end of the day, the vendor has profits of
{{{ .2*5x + .15*2x }}} =
{{{ x + .3x = 1.3x }}}
{{{ 1.3x = 390 }}} (given)
{{{ x = 300 }}}
He sold 300 oranges