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a fost răspuns

Stiind ca x,y,z sunt direct proportionale cu 4/5, 5/2 , 3/4 si x+y+z=1 aflati x,y,z.

Răspuns :

x=4m/5
y=5m/2
z=3m/4
4m/5+5m/2+3m/4=1
(16m+50m+15m)/20=1
81m=20
m=20/81
x=80/405
y=100/162
z=60m/324

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