There is a batch of apples, which are distributed to the children in two classes in kindergarten, with an average of 6 apples per person. If you give it to the children in the big class, everyone will get 10 apples on average. How many apples will each of them get if they are only given to the small class?

The number of people is just 1.5 times that of the small class, so the small class can be divided into 6+6* 1.5= 15.