Each solid 10-foot section of a redwood tree weighs 400 pounds. Termites ate 30% of this redwood's wood. If the redwood is 200 feet tall, how much does it weigh?
First find how many 10-foot sections are in the redwood: 200 feet / 10 feet/section = 
<gadget id="calculator">200/10</gadget>
<output>20</output>
20 sections.
Then multiply the number of sections by the weight of each section to find the total weight of the redwood: 20 sections * 400 pounds/section = 
<gadget id="calculator">20*400</gadget>
<output>8_000</output>
8000 pounds.
Then find the amount of the wood the termites ate: 8000 pounds * 30% = 
<gadget id="calculator">8000*30*.01</gadget>
<output>2_400</output>
2400 pounds.
Then subtract that amount from the total weight of the wood: 8000 pounds - 2400 pounds = 
<gadget id="calculator">8000-2400</gadget>
<output>5_600</output>
5600 pounds.

<result>5_600</result>