A store received 20 pallets of paper products to stock. Half the pallets were paper towels, a quarter were tissues, and a fifth were paper plates. The rest were paper cups. How many pallets of paper cups did the store receive?
The store received 20 / 2 = 
<gadget id="calculator">20/2</gadget>
<output>10</output>
10 pallets of paper towels.
They received 20 / 4 = 
<gadget id="calculator">20/4</gadget>
<output>5</output>
5 pallets of tissues.
They received 20 / 5 = 
<gadget id="calculator">20/5</gadget>
<output>4</output>
4 pallets of paper plates.
Thus, the store received 20 - 10 - 5 - 4 = 
<gadget id="calculator">20-10-5-4</gadget>
<output>1</output>
1 pallet of paper cups.

<result>1</result>