James delivers 600 newspapers in a day. He delivers 198 newspapers to District A, some to District B and 209 newspapers to District C. How many newspapers does he deliver to District B?
He delivers to District A and C a total of 198+209 = 
<gadget id="calculator">198+209</gadget>
<output>407</output>
407 newspapers.
He delivers 600 in total so District B will get the remainder which is 600-407 = 
<gadget id="calculator">600-407</gadget>
<output>193</output>
193 newspapers.

<result>193</result>