vă rog cât mai repede!problema 20dau coroana

a+b+c=972
a+b=c
a/2=b
=> c+c=972 => 2c=972 => c=486
a+a/2=c=486 |*2 => 3a=972 => a=324
=> 324+b=486 => b=162
=>b+c=162+486=648