Question

( 320 + X ) : X + 120 = 131

Answer 1

(320 + x) : x + 120 = 131

(320 + x) : x = 131 - 120

(320 + x) : x = 11

320 : x + x : x = 11

320 : x + 1 = 11

320 : x = 11-1

320 : x = 10

x = 320 : 10

x = 32

Answer 2

( 320 + x ) : x + 120 = 131

( 320 + x ) : x = 131 - 120

 ( 320 + x ) : x = 11

  320 : x + x : x = 11

  320 : x + 1 = 11

  320 : x = 11 - 1

  320 : x = 10

  x = 320 : 10

  x = 32

Answer 3

Ta có :(320 + x) : x + 120 = 131

(320 + x) : x = 131 - 120

(320 + x) : x = 11

320 : x + x : x = 11

320 : x + 1 = 11

320 : x = 11-1

320 : x = 10

x = 320 : 10

x = 32

Vậy x=32