At a birthday party, 30% of the guests are married, 50% are single, and the rest are children. If there are 1000 guests, how many more married people are there than children?
There are 1000 x 30/100 = 
<gadget id="calculator">1000*30/100</gadget>
<output>300</output>
300 people who are married.
There are 1000 x 50/100 = 
<gadget id="calculator">1000*50/100</gadget>
<output>500</output>
500 people who are single.
So, there are a total of 300 + 500 = 
<gadget id="calculator">300+500</gadget>
<output>800</output>
800 that are either married or single.
This means, 1000 - 800 = 
<gadget id="calculator">1000-800</gadget>
<output>200</output>
200 are children.
Therefore, there are 300 - 200 = 
<gadget id="calculator">300-200</gadget>
<output>100</output>
100 more married people than children.

<result>100</result>