Adam teaches 50 students a year. How many students will Adam teach in 10 years if in the first year he only teaches 40 students?
Adam will teach 50 * 9 = 
<gadget id="calculator">50*9</gadget>
<output>450</output>
450 students in 9 years.
So, in 10 year Adam will teach 450 + 40 = 
<gadget id="calculator">450+40</gadget>
<output>490</output>
490 students.

<result>490</result>