Răspuns :
[tex]\displaystyle\bf\\\frac{x}{2}+\frac{x}{4}=63\\\\\frac{2x}{4}+\frac{x}{4}=63\\\\\frac{2x+x}{4}=63\\\\\frac{3x}{4}=63\\\\3x=63\times4\\\\x=\frac{63\times4}{3}\\\\x=21\times4\\\\\boxed{\bf~x=84}[/tex]
a : 2 + a : 4 = 63 | × 4
2 × a + a = 252
3 × a = 252
a = 252 : 3
a = 84 => numărul
