Let the ages of these three persons be represented by L, S and B. Then,
L=2S, and B/3=S.
With L=50, 50=2S, and so S= 25.
Since B/3=S, B=3S, so that B here is 75.
Lisa is 50, Brad is 75 and Sam is 25 (years of age).
Lisa is 50 years
Sam is 50 / 2 = 25 years
Brad is 25 * 3 = 75 years
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