Question 1128721
Let {{{ x }}} = number of child's tickets
Let {{{ y }}} = number of adult tickets
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{{{ 10y + 6x > 600 }}}
{{{ 5y + 3x > 300 }}}
You can't solve. There is no way to know
how many tickets there are 
Say you only have 1 adult ticket.
{{{ 6*1 + 3x > 300 }}}
{{{ 3x > 294 }}}
{{{ x > 98 }}}
But you get other values for {{{ x }}} if you
change {{{ y }}}