Jenny is dividing up a pizza with 12 slices. She gives 1/3 to Bill and 1/4 to Mark. If Jenny eats 2 slices, how many slices are left?
First find how many slices 1/3 of the pizza is by multiplying 1/3 by the total number of slices: 12 slices * 1/3 = 
<gadget id="calculator">12*1/3</gadget>
<output>4</output>
4 slices.
Do the same thing to find how many slices 1/4 of the pizza is: 12 slices * 1/4 = 
<gadget id="calculator">12*1/4</gadget>
<output>3</output>
3 slices.
Then subtract the slices each of the three people ate to find the remaining number of slices: 12 slices - 4 slices - 3 slices - 2 slices = 
<gadget id="calculator">12-4-3-2</gadget>
<output>3</output>
3 slices.

<result>3</result>