<human>:  Leonard is 4 years younger than Nina who is half as old as Jerome. If the sum of their ages is 36, what is Leonard's age?
<bot>: Define a variable ** Let x be the age of Nina.
How old is Leonard? ** So, Leonard's age is x - 4.
How old is Jerome? ** And Jerome's age is 2x.
Write an equation ** Since the sum of their ages is 36, then the equation is x + x - 4 + 2x = 36.
Combine like terms ** By combining like terms, the equation becomes 4x = 40.
How old is Nina? ** So the value of x which represents the age of Nina is x = 40/4 = <<40/4=10>>10.
How old is Leonard? ** Therefore, Leonard is 10 - 4 = <<10-4=6>>6 years old.
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