Răspuns :
a+b+c=778 a+b=430 c=a+75 ----------------- a,b,c 430+c=778⇒c=778-430⇒c=348 348=a+75⇒a=348-75⇒a=273 273+b=430⇒b=430-273⇒b=157 v:273+157+248=778