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:
| Engine | Power, continuous | Power, takeoff | Compression ratio | Supercharger gear ratio | Octane rating | Dry weight |
| --- | --- | --- | --- | --- | --- | --- |
| Wasp Jr. A | hp (kW) at 2,000 RPM | same | 5.0:1 | 7:1 | 68 | lb (kg) |
| Wasp Jr. TB | hp (kW) at 2,200 RPM | hp (kW) at 2,300 RPM | 6.0:1 | 8:1 | 80 | lb (kg) |
| Wasp Jr. SB | hp (kW) at 2,200 RPM | hp (kW) at 2,300 RPM | 6.0:1 | 10:1 | 80/87 | lb (kg) |
| Wasp Jr. T1B2 | hp (kW) at 2,300 RPM | same | 6.0:1 | 10:1 | 80/87 | lb (kg) |
| Wasp Jr. B4 | hp (kW) at 2,300 RPM | same | 6.0:1 | 10:1 | 80/87 | lb (kg) |
| Wasp Jr. SC-G | hp (kW) at 2,700 RPM | hp (kW) at 2,850 RPM | 6.7:1 | 10:1 | 100 | lb (kg) |
Question:
Which supercharger gear ratio has a Octane rating of 68?
Answer:
7:1