There are 6 horses, 12 pigs and 12 rabbits on the farm. Last week, each horse ate 20kg of apples, each pig ate 15kg of apples and each rabbit ate 5kg of apples. Find the average amount of apples eaten by each animal last week. 
Overseas Competition->Knowledge Point->Calculation Modules->Whole Numbers->Whole Numbers Multiplication and Division->Understanding Meanings of Multiplication