Hey there!
We know that the age of grandpa (g) is eight times Andrew’s current age (a). We also know that grandpa was 56 when Andrew was born. We don’t know how long ago that was, but we know that if take grandpas current age and subtract Andrew’s current age, we will have 56. So, here’s our information.
g=8a
g-a=56
Since we know that g equals 8a, we can just use that in the second equation to solve for Andrew’s age.
8a-a=56
7a=56
We divide both sides by seven.
a=8
Therefore, Andrew is eight years old!
I hope that this helps!
