Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Position | Gymnast | A Score | B Score | Total |
| --- | --- | --- | --- | --- |
| 1st | Diego Hypólito ( BRA ) | 6.6 | 9.35 | 15.95 |
| 2nd | Marian Drăgulescu ( ROU ) | 6.9 | 9.025 | 15.925 |
| 3rd | Gervasio Deferr ( ESP ) | 6.5 | 9.325 | 15.825 |
| 4th | Fabian Hambuechen ( GER ) | 6.5 | 9.3 | 15.8 |
| 5th | Kōhei Uchimura ( JPN ) | 6.5 | 9.225 | 15.725 |
| 6th | Zou Kai ( CHN ) | 6.7 | 9.1 | 15.7 |
| 7th | Anton Golotsutskov ( RUS ) | 6.5 | 9.1 | 15.6 |
| 8th | Alexandr Shatilov ( ISR ) | 6.6 | 9.0 | 15.6 |
Question:
what is the sum of the b score when the a score is 6.6 and the total is 15.6?
Answer:
9.0