Respuesta :

mathstudent55

Answer:

23 years old

Step-by-step explanation:

Let x = age of younger sibling.

Then, the age of the older sibling is x + 9.

x + x + 9 = 55

2x = 46

x = 23

Answer: 23 years old
X + X + 9 =55
2x = 55 - 9
X = 46/2
X = 23