Solution

36703

First name
David Zhang
School
YCIS Beijing
Country
Age
6

The 1st week grows 1x2=2 branchs.
The 2nd week grows 2x2=4 branchs.
The 3rd week grows 4x2=8 branchs.
The 4th week grows 8x2=16 branchs.
The 5th week grows 16x2=32 branchs.
The 6th week grows 32x2=64 branchs.
that´s why there are 64 flowers.