Three people walked through the snow in their winter boots. In which order did they walk through the snow?

Mother halves the birthday cake. One half she then halves again. Of that she again halves one of the smaller pieces. Of these smaller pieces she once more halves one of them (see diagram). One of the two smallest pieces weighs 100 g. How much does the entire cake weigh?

All dogs are equally heavy. How much could one dog weigh?

Sara has 16 blue marbles. She can swap her marbles in the following way: For 3 blue marbles she gets 1 red marble. For 2 red marbles she gets 5 green marbles. What is the maximum number of green marbles she can get?

A full glass of water weighs 400 grams. An empty glass weighs 100 grams. How much does a half-full glass of water weigh?

Anna uses 32 small grey squares to frame a 7 cm by 7 cm big picture. How many small grey squares does she have to use to frame a 10 cm by 10 cm big picture? 00

The pages of a book are numbered with 1, 2, 3, 4, 5 and so on. The digit 5 appears exactly 16 times. What is the maximum number of pages the book can have?

There live exactly 15 animals on a farm: cows, cats and kangaroos. We know that exactly 10 animals are not cows and exactly 8 animals are not cats. How many kangaroos live on the farm?

Marta sticks several triangles on top of each other and makes a star that way. What is the minimum number of triangles she has used?

One of the 5 children Alex, Bartek, Cora, Dani and Emil has eaten a cake. Alex says: „I did not eat a cake.“ Bartek says: „I ate a cake.“ Cora says: „Emil has not eaten a cake.“ Dani says: „I did not eat a cake.“ Emil says: „Alex has eaten a cake.“ One of the children lies. Which child has eaten a cake?

From above, the corridor of a school looks like in the diagram. A cat walks along the dotted line drawn in the middle of the room. How many meters does the cat walk?