Solution

36514

First name
George Coomber
School
Jolesfield primary school
Country
Age
10

what i did was put the envelopes from smallest.this solution was a bit of luck.
i started of with putting the envelopes into the order smallest to largest.

here is my solution.

3 7 8 13 14
1,2 4,3 8,0 6,7 9,5

0 ,1 ,2 ,3 ,4 ,5 ,6 ,7 ,8 ,9

thank you :)