Joel is 5 years old and his dad is 32 years old.  How old will Joel be when his dad is twice as old as him?
The difference in age between Joel and his dad is 32 - 5 = <<32-5=27>>27 years.
When you double this gap in years, you have 27 x 2 = <<27*2=54>>54.
When his dad is 54, Joel will be 54 / 2 = <<54/2=27>>27 years old.
#### 27