Question

8*5-(u-1) +27:9-76:4=13

Answer 1

8 × 5 - ( u - 1) + 27 : 9 - 76 : 4 = 13

40 - ( u - 1) + 3 - 19 = 13

40 - ( u - 1) = 13 + 19 - 3 → metoda mersului invers

40 - ( u - 1) = 29

u - 1 = 40 - 29

u - 1 = 11

u = 11 + 1

u = 12 → numarul

Verific: 40 - ( 12 - 1) + 3 - 19 = 40 - 11 + 3 - 19 = 29 + 3 - 19 = 32 - 19 = 13

Answer 2

40-(u-1)+3-19=13

40-(u-1)+3=32

40-(u-1)=29

u-1=11

u=12