A plague infects ten people. Every day, each infected person infects six others. How many people are infected after three days?
On the first day, the original ten people infect six people each, so 10 * 6 = 
<gadget id="calculator">10*6</gadget>
<output>60</output>
60 more people are infected.
There are 10 + 60 = 
<gadget id="calculator">10+60</gadget>
<output>70</output>
70 infected people after the first day.
On the second day, 70 * 6 = 
<gadget id="calculator">70*6</gadget>
<output>420</output>
420 more people are infected.
There are 70 + 420 = 
<gadget id="calculator">70+420</gadget>
<output>490</output>
490 infected people after the second day.
On the third day, 490 * 6 = 2940 more people are infected. Therefore, there are 490 + 2940 = 3430 infected people after three days.

<result>3_430</result>