Solution

160881

First name
Elmhurst
School
Elmhurst School for Boys
Country
Age
0

The boys calculated a volume of 100 bears which was 3200cm cubed.
Then, they found the dimensions of different jars: 32 x 10 x 10 or 16 x 20 x 10 or 8 x 20 x 20 which would have sufficient capacity to hold all of the bears.
They are still looking for different dimensions.