Respuesta :

ntowry

Answer:

12

Step-by-step explanation:

x + 40 = 28

x = -12

Answer: Artaud is 12 years old.

Step-by-step explanation: I started by finding the difference between 40 and 28.

40 - 28 = 12

So since he is taking the opposite of his age he must have done -12 because:

-12 + 40 = 28