Question

suma dintr-o optime dintr- un nr si nr insusi este 63Care este nr?

Answer 1

a/8+a=63
a+8a=504
a=504:9
a=56

Answer 2

$\frac{x}{8}+x=63\  |\cdot8 \\\\x+8x=63\cdot8\\\\ 9x=63\cdot8\\\ x= \frac{63\cdot8}{9}\\\\ x=7\cdot8\\\\x=\boxed{56}$