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21+3
24+3
27
18+
21+
24+
27
90
- 4 hermanos, cada uno mayor por 3 años al que le sigue
RESOLUCIÓN
menor: X=18
tercero: X+3 = 18+3=21
segundo: X+6 = 18+6=24
mayor: x+9 = 18+9=27
⇒X+X+3+X+6+X+9=90