Betty is 60 years old, and she is the oldest person in the family. Her daughter is 40 percent younger than she is, and her granddaughter is one-third her mother's age. How old is the granddaughter?
Betty's daughter is 40/100 * 60 = <<40/100*60=24>>24 years younger than she is.
That means her daughter is 60 - 24 = <<60-24=36>>36 years old.
So the granddaughter is 1/3 * 36 = <<1/3*36=12>>12 years old.
#### 12