1. (7 points) An apprentice chef took two buckets of unpeeled potatoes and cleaned everything in an hour. In the process, $25 \%$ of the potatoes went into peels. How long did it take for him to accumulate exactly one bucket of peeled potatoes?
Solution. Since a quarter of the potatoes went into peels, then in one hour, three quarters of two buckets of cleaned potatoes were obtained. This means that in one hour, the trainee cook got $\frac{3}{2}$ buckets, and exactly one bucket in 40 minutes.

Answer. 40 minutes.

## Comments on Evaluation.

Correct answer only - 1 point.

Correct reasoning - 2 points.

Correct approach, but an arithmetic error was made (with a reasonable answer) - 5 points.