Solution

36348

First name
Daniel Chand
School
Brewers Hill Middle School
Country
Age
12

To work out the solution,I found all the possible combinations to the envelope.

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

Then I paired together different combinations until I discovered the correct group of numbers inside each envelope.

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