There are 2000 pinecones on the ground. 20% are eaten by reindeer. Twice as many are eaten by squirrels as reindeer. 25% of the remainder are collected to make fires. How many pinecones are left?
First find the number of pinecones eaten by reindeer: 20% * 2000 pinecones = 
<gadget id="calculator">20*.01*2000</gadget>
<output>400</output>
400 pine cones.
Then find the total number of pinecones eaten by squirrels: 400 pine cones * 2 = 
<gadget id="calculator">400*2</gadget>
<output>800</output>
800 pine cones.
Then subtract those two amounts to find the number of pinecones left: 2000 pinecones - 400 pine cones - 800 pine cones = 
<gadget id="calculator">2000-400-800</gadget>
<output>800</output>
800 pinecones.
Divide that number by 4 to find the number that are collected for fires: 800 pinecones / 4 = 
<gadget id="calculator">800/4</gadget>
<output>200</output>
200 pine cones.
Then subtract that number from the 800 pinecones to find the total left on the ground: 800 pine cones - 200 pinecones = 
<gadget id="calculator">800-200</gadget>
<output>600</output>
600 pine cones.

<result>600</result>