# The sum of Alan’s age and Bob’s age is 40. The sum of Bob’s age and Carl’s age is 34. The sum of Alan’s age and Carl’s age is 42. How old is Bob?

###### Question:

The sum of Alan’s age and Bob’s age is 40.
The sum of Bob’s age and Carl’s age is 34. The
sum of Alan’s age and Carl’s age is 42. How
old is Bob?

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