What position does each man fill?

Question

In a certain bank the position of cashier, manager and teller are held by Brown, Jones and Smith, though not necessarily respectively.
The teller, who was an only child, earns the least.
Smith, who married Brown's sister, earns more than the manager.
What position does each man fill?

Answer 1

Cashier- Smith
Manager- Brown
Teller- Jones

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Brown cannot be the teller since he has a sister, and thus is not an only child. Also Smith cannot be the teller since he does not earn the least. So the teller must be Jones. Smith earns more than the manager, so he must be the cashier, leaving Brown to be the manager.