Question 534901
Let {{{x}}} = number of $2.50 cassettes
{{{ x/2 }}} = number of $1.50 cassettes
given:
{{{ 2.5x + 1.5*(x/2) = 13 }}}
{{{ 5x + 1.5x  = 26 }}}
{{{ 6.5x = 26 }}}
{{{ x = 4 }}}
{{{ x/2 = 2 }}}
He bought 4 $2.50 cassettes
He bought 2 $1.50 cassettes