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a1 = 10·a + 1
a2 = 10·a + 2
..
..
a9 = 10·a + 9
Entonces:
a1 + a2 + a3 + ... + a9 = (10·a + 1) + (10·a + 2)+...+ (10·a + 9) =
= 90·a + 45 = 5bc
Ahora debes buscar un múltiplo de 90 que al sumarle 45 la cifra de las centenas sea 5:
90·4 + 45 = 360 + 45 = 405
90·5 + 45 = 450 + 45 = 495
90·6 + 45 = 540 + 45 = 585
Por lo tanto a = 6, b = 8, c = 5
Y a·b·c = 6·8·5 = 240
Saludos!