Răspuns:
1465
Explicație pas cu pas:
abcd+bcd+cd+d=2000
1000a+100b+10c+d+100b+10c+d+10c+d=2000
1000a+200b+30c+4d=2000 |:2
500a+100b+15c+2d=1000, ⇒c par, d=5, c=6, b=4, a=1
verificare: 500+400+90+10=1000
Numarul cautat: 1465
1465+465+65+5=1930+70=2000
