<human>:  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?
<bot>: How many students will Adam teach in 9 years? ** Adam will teach 50 * 9 = <<50*9=450>>450 students in 9 years.
How many students will Adam teach in 10 years? ** So, in 10 year Adam will teach 450 + 40 = <<450+40=490>>490 students.
#### 490