Respuesta :

Answer:

X = 11

Step-by-step explanation:

(13 + 17 + 15 + 20 + 14 + x) ÷ 6 = 15

13 + 17 + 15 + 20 + 14 + x = 15 x 6

13 + 17 + 15 + 20 + 14 + x = 90

13 + 17 + 15 + 20 + 14 = 79

79 + x = 90

90 - 79 = 11

X = 11