Question

Numerele 3,x,5 sunt direct proportionale cu y,54,45.Calculati x+y si y-x.

Answer 1

3 / y = x / 54 = 5 / 45;
5 / 45 = 1 / 9 ;
Atunci 3 / y = 1 / 9 <=> y = 27 si  x / 54  = 1 / 9 <=> x = 54 / 9 <=> x = 6 ;
Atunci x + y = 33 si y - x = 21 .

Bafta !

Answer 2

 [tex]\frac{3}{y}=\frac{x}{54}=\frac{5^{(5}}{45}\;;\\ \frac{3}{y}=\frac{1}{9}\rightarrow\;y=27\;;\\ \frac{x}{54}=\frac{1}{9}\rightarrow\;x=6\;;\\ \Rightarrow\;\;x+y=33\;\;si\;\;y-x=21\;;[/tex]