Răspuns:
[tex]\frac{x}{a} = \frac{y}{b} =\frac{z}{d} = \frac{t}{d} = 5 \\\\rezulta\\x=5a\\y=5b\\z=5c\\t=5d\\\\adunam\\x+y+z+t = 5a+5b+5c+5t = 5(a+b+c+d) = 5*110 = 550[/tex]
