Sylvia had one-fifth of incorrect answers in the exam, while Sergio got 4 mistakes. If there were 50 questions, how many more correct answers does Sergio have than Sylvia?
Sylvia got 50/5 = 
<gadget id="calculator">50/5</gadget>
<output>10</output>
10 incorrect answers.
This means she got 50 - 10 = 
<gadget id="calculator">50-10</gadget>
<output>40</output>
40 correct answers.
Sergio got 50 - 4 = 
<gadget id="calculator">50-4</gadget>
<output>46</output>
46 correct answers.
So, Sergio got 46 - 40 = 
<gadget id="calculator">46-40</gadget>
<output>6</output>
6 more correct answers than Sylvia.

<result>6</result>