human
Alvin is 30 years old and Simon is 5 years away from being 1/2 the age of Alvin. How old is Simon?
assistant
How old is Alvin? ** 1/2 the age of Alvin who is 30 is 30/2 = <<30/2=15>>15
How old is Simon? ** Simon is 5 years away from being half the age of Alvin so Simon is 15-5 = <<5+5=10>>10 years old
#### 10