Question

a/b=0,4
a+b=21
a,b =?

Answer 1

 [tex]\frac{a}{b}=\frac{4^{(2}}{10}=\frac{2}{5}\;\\ \Rightarrow\;\frac{a}{2}=\frac{b}{5}=\frac{a+b}{2+5}=21/7=3\;;\;\\ \Rightarrow\;\;a=2\cdot3=6\;\;si\;\;b=5\cdot3=15.[/tex]