n1=2k
n2=2k+2
n3=2k+4
n1+n2+n3=6k+6=30 ⇒ k=24:6=4 ⇒
n1=8
n2=10
n3=12
n1+n2+n3+n4=30+n4=42 ⇒
n4=42-30=12
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Verificare: n1+n2+n3+n4=8+10+12+12=42 OK.
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Succes in continuare!
