Let <em>A</em> be your age, <em>B</em> be the age of your brother and <em>S</em> be the age of your sister.
Since your brother is 1/4 your age, then:

Since your sister is 8 years older than your brother, then:

Since your sister is 12 years old, then:

Use the second equation to find your brother's age by plugging in <em>S=12</em>:

Plug in <em>B=4</em> in the first equation to find your age:

Therefore, you are 16 years old.
Answer:
I got 1,475
Step-by-step explanation: