A coffee costs 2 Euros A tea costs 3 Euros input(How much is a $coffee) && fact(A $coffee costs $x euros) => output($x Euros) input(How much is a $coffee and a $tea) && fact(A $coffee costs $x euros) && fact(A $tea costs $y euros) && $z = eval(formatDouble(parseDouble($x) + parseDouble($y), 2)) => output($z Euros)