Solution

39472

Problem / game
Fifteen cards Back to problem
First name
Proud
School
British international school ho chi minh city
Country
Thailand
Age
9

How I worked it out:

6 plus 9 is 15.
9 plus 11 is 20.
11 plus 12 is 23.
12 plus 4 is 16.
4 plus 14 is 18.
14 plus 7 is 21.

So the answer is:
6 9 11 12 4 14 7