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1. Yes,
David is older than sam
Carle= -3 years for sam
-4 years for david
three is less than 4 therefore david is older than sam and carle.
2.David~21 years old total
Carle~-04 years younger
Carle is 17 years old.
Since Sam is 3 years older than Carle......
Sam is 20 years old.
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