conversations.from: human
conversations.value: Stephen ordered 2 large pizzas, both cut into 12 slices.  He ate 25% of the pizza.  His friend Pete ate 50% of the remaining pizza.  How many slices are left over?
conversations.from: assistant
conversations.value: He ordered 2 pizzas, each cut into 12 slices so that’s 2*12 = 24 slices
  Stephen ate 25% of the pizza so he ate .25*24 = 6 slices
  That leaves 24-6 = 18 slices
  18 slices are left and Pete eats 50% of 18 slices so he eats 18*.50 = 9 slices
  If there were 18 slices and Pete ate 9 slices then there are 18-9 = 9 slices left over