John is twice as old as Mary and half as old as Tonya. If Tanya is 60, what is their average age?
John is twice as old as Mary and half as old as Tonya. If Tonya is [NUMBER], what is their average age?
John is 30 because 60 / 2 = <<60/2=30>>30
Mary is fifteen because 30 / 2 = <<30/2=15>>15
Their total age is 105 because 60 + 30 + 15 = <<60+30+15=105>>105
Their average age is 35 because 105 / 3 = <<105/3=35>>35
#### 35