In the school canteen queue, Vika, Sonya, Borya, Denis, and Alla are standing. Vika is in front of Sonya but after Alla; Borya and Alla are not standing next to each other; Denis is not standing next to Alla, Vika, or Borya. In what order are the kids standing?

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Recall problems $71,144,195$.

## Solution

For convenience, let's repeat the conditions: 1) Vika stands in front of Sonya but after Alла; 2) Borya and Alла do not stand next to each other; 3) Denis does not stand next to Alла, Vika, or Borya. From condition 1, it follows that the girls stand in the following order: Alла, Vika, Sonya. Since neither Denis nor Borya stand next to Alла (conditions 2 and 3), Alла must stand first, and Vika second. From condition 3, it follows that Denis can only stand at the edge - next to Sonya. And from conditions 2 and 3, it follows that Borya can only stand between Vika and Sonya. Therefore, the children stand in the following order: Alла, Vika, Borya, Sonya, Denis.

## Answer

Alла, Vika, Borya, Sonya, Denis.

In the warehouse, there were 100 kg of berries, with a water content of $99 \%$. Due to long storage, the water content in the berries decreased to $98 \%$. How much do the berries weigh now?

## Hint

Notice that initially, the berries contained 1 kg of "dry matter".

## Solution

At the beginning of storage, the berries contained $1 \%$ dry matter. By the end of storage, this same weight constituted $2 \%$ of the total weight of the berries. Therefore, the weight of the berries has decreased by half.

## Answer

50 kg.