If one represents 3, then write the number represented in the diagram:
9936
Since each is 3, there are 3 cylinders in thousands =3 × 3 thousands = 9000
3 cylinders in hundred = 3 × 3 hundreds = 900
1 cylinder in tens = 3 × 1 tens = 30
2 cylinders in ones = 3 × 2 ones = 6
Hence the number is 9936.