Question

Daca dintr-un numar scadem 3, apoi 10 si,respectiv, 11 ,obtinem trei diferente care adunate dau numarul initial. Care este acest numar?

Answer 1

(x-3)+(x-10)+(x-11)=x
3x-24=x
2x=24
x=12

Vf. (12-3)+(12-10)+(12-11)=9+2+1

Answer 2

x-3=p; x-10=q; x-11=t; x=p+q+t; q=t+1; p=q+7=t+8; x=t+t+1+t+8; x=3t+9; 3t+9-11=t; 3t-2=t; 2t=2; t=1; x=3t+9; x=12