Question

{[(a:2)+a]:3}:4=10
Spuneti-mi si mie raspunsul

Answer 1

{ [ ( a : 2 ) + a ] : 3 } : 4 = 10

( a : 2 ) + a = 10 × 4 × 3

( a + 2 a ) / 2 = 120

3 × a = 2 × 120

a = 240 : 3  

a = 80 → numarul, aflat prin metoda mersului invers