1. Russia, Germany, and France decided to build the Nord Stream 2 gas pipeline, 1200 km long, agreeing to finance this project equally. In the end, Russia built 650 kilometers of the pipeline, Germany built 550 kilometers of the pipeline, and France contributed its share in money. Germany received 1.2 billion euros from France. How much should Russia receive from France?
Solution. Each country was supposed to build 400 kilometers of the gas pipeline. Thus, Russia built 250 km of the pipeline for France, and Germany built 150 km of the pipeline. Therefore, the money from France should be distributed between Russia and Germany in a ratio of 5:3. Hence, Russia will receive 1.2 billion $\times \frac{5}{3}=2$ billion euros from France.

Answer: 2 billion euros.

## Recommendations for checking

It is derived that Russia will receive 1.2 billion $\times \frac{5}{3}$, but it is calculated incorrectly - 6 points.