A family bought 1 box of pizza that is cut into 16 slices. Only three-fourths of the pizza was eaten by the family. How many slices of pizza were left?
The family ate 16 x 3/4 = 
<gadget id="calculator">16*3/4</gadget>
<output>12</output>
12 slices.
So, there were 16 - 12 = 
<gadget id="calculator">16-12</gadget>
<output>4</output>
4 slices of pizza left.

<result>4</result>