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:
| Sn/Sb (%) | Liquidat (°C) | Solidat (°C) | Hardness ( Brinell ) | Purpose |
| --- | --- | --- | --- | --- |
| 6/15 | 261.0 | 240.0 | 23.0 | Routine |
| 10/16 | 273.0 | 240.0 | 27.0 | Dual (machine & hand composition) |
| 9/19 | 286.0 | 240.0 | 28.5 | Routine machine composition |
| 13/17 | 283.0 | 240.0 | 29.5 | Catalogues |
| 12/24 | 330.0 | 240.0 | 33.0 | Display type, heavy duty jobs |
Question:
How many Liquidat (c) have a purpose of dual (machine & hand composition)?
Answer:
1.0