3. Mowgli asked five monkeys to bring him some nuts. The monkeys collected an equal number of nuts and carried them to Mowgli. On the way, they quarreled, and each monkey threw one nut at each of the others. As a result, they brought Mowgli half as many nuts as they had collected. How many nuts did Mowgli receive? Be sure to explain your answer.
Answer: 20 nuts.

## Solution.

Each monkey threw 4 nuts, so the monkeys threw a total of $5 \cdot 4=20$ nuts together.

If half of the nuts remained, it means that Mowgli brought as many nuts as were thrown, which is 20 nuts.

## Grading Criteria.

- Correct solution - 7 points.
- Very brief solution (such as "5 - $4=20$ nuts, and since half remained, 20 nuts") - 5-6 points.
- Generally correct approach, but the student thinks each monkey threw 5 nuts and gets the wrong answer - 2 points.
- Only the correct answer - 2 points.