20(20+q)(20+2q) = 16640
2(20+q)(10+q) = 832
q^2 + 30q +200 = 416
q^2 +30q -216 = 0
q1,2 = -15+/-rad(225+216) = -15 +/- rad 441 = -15 +/- 21
q1 = -36, nu convine conditiei ca nr cel mai mic este 20.
q2 = 6 si avem
numerele 20,26,32.
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Verificare: 20x26+32 = 520 x 32 = 16640 OK.
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