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Calculati 2m+ 4n =2p
Stiind ca m+n=40 si n+p=60


Răspuns :

m+n=40   ⇒  2m+2n=80
n+p=60   ⇒  2n+2p=120
                    2m+4n+2p=80+120
                    2m+4n+2p=200

m+n=40|*2
n+p=60|*2
2m+2n=80
2n+2p=120
Adunam cele doua relatii
2m+4n+2p=200