The 3 x 3 x 3 cube in the picture is made of 27 small cubes.

How many small cubes do you have to remove to see the following result when viewing from the right, from above, and from the front ?

Andy made a playlist 5 songs ( A, B, C, D and E ). Song A is 3 minutes long, song B is 2 minutes and 30 seconds, song C is 2 minutes, song D is 1 minute and 30 seconds, and song E is 4 minutes. The songs play in this order in a continuous loop. If Andy left the house when song C was just starting, what song was playing when he got back home 1 hour later ?

Dan entered the numbers from 1 to 9 in the cells of a  3 x 3 table. He began by placing the numbers 1, 2, 3 and 4 as shown in the picture:

It so happened that for the number 5, the sum of the numbers in the adjacent cells ( having a common side ) was equal to 9. What is the sum of the numbers adjacent to the number 6 ?

Rabbit Vasya loves cabbage and carrots. In a day, he eats either 9 carrots, or 2 heads of cabbage, or I head of cabbage and 4 carrots. But some days he only eats grass. Over the last 10 days, Vasya ate a total of 30 carrots and 9 heads of cabbage. On how many of these 10 days did he eat only grass ?

Trees grow on only one side of Park Avenue. There are 60 trees in total. Every second tree is a maple, and every third tree is either a linden or a maple. The remaining trees are birches. How many birches are there ?

Granny has 10 grandchildren, all of different ages. Alice is the eldest. The sum of the ages of all grandchildren is 180. At least how old is Alice ?

A thin colourful ribbon is stuck on a transparent plastic cube ( see the picture ).

Which of the following pictures does not represent the cube as seen from any perpective ?

Bob is going to visit four cities. He will start from and end up in his home town. The figure shows a map of the regions with the cities. The roads are only along the grid lines.

Bob wants to make the trip as short as possible. Which route should Bob follow ?

A rectangle with a perimeter of 34 cm was divided into two smaller rectangles with perimeters 28 cm and 30 cm, as shown in the figure.

What is the are of the big rectangle ?

On Jump Street, there are 9 houses in a row. At least one person lives in each house. Any two neighbouring houses together are inhabited by at most six people. What is the largest number of people that could be living on Jump Street ?

In which of the figures is exactly one half of the area shaded ?

My umbrella has the letters KANGAROO printed on the top, as shown in the picture on the right. Which of the five smaller pictures does not show my umbrella ?

There are ten ducks. Five of these ducks each lay an egg every day. The other five ducks each lay an egg every second day. How many eggs in total do the ten ducks lay in a period of 10 days ?

The figure shows a board where each small square has an area of 4 cm². What is the length of the thick black line ?

The two pictures of the balanced scales show the birds Rita and Dita

How much does Dita weigh ?