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stind ca x/3=y/5=z/7 si ca x+y+2z=440

Răspuns :

x/3=y/5=z/7=k
x=3k
y=5k
z=7k
x+y+2z=440
3k+5k+2*7k=440
3k+5k+14k=440
22k=440
k=440/22
k=20
x=3*20=60
y=5*20=100
z=7*20=140
proba
x+y+2z=
60+100+2*140=
60+100+280=440