Andy C. answered • 11/21/17

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David's age is D

The total of their ages is 57:

Dan + David + Bridget = 57

(D+5) + D + (D-8) = 57 <--- Dan is 5 years older than David; Bridgett is 8 years younger than David

3D - 3 = 57

3D = 60

D=20

David is 20

Dan is 25

Bridgett is 12