Question

determinati numerele a si b stiind ca a=3b si media lor aritmetica este egala cu 84.
Urget!! Va rog@!!!

Answer 1

[tex]M_a=\frac{a+b}{2}=\frac{3b+b}{2}=\frac{4b}{2}=2b=84\ \Rightarrow\\ b=84:2=42\\ a=3b=126[/tex]

Answer 2

$a=3b \\ \frac{a+b}{2}=84 \\ \frac{3b+b}{2}=84 \\ \frac{4b}{2}=84 \\ 2b=84 \\ b=\frac{84}{2} \\ b=42 \\ a=3b=42*3=126$