Zoe has two cards. She wrote a number on both sides of each card. The sum of the two numbers on the first card equals the sum on the second card. The sum of all four numbers is 32. What could be the two numbers on the sides that we cannot see?
Five children had a paper square, a paper triangle and a paper circle. Every child placed their own papers in a pile, as shown. How many children placed the triangle above the square?
Loes has started to write some numbers in the table. She decides that each row and column will contain the numbers 1, 2 and 3 exactly once. What is the sum of the numbers that she will write in squares A and B?
John has a board with 11 squares. He puts a coin in each of eight neighboring squares without leaving any empty squares between the coins. What is the maximum number of squares in which one can be sure that there is a coin?
Having turned a card over around its right side, we see what is drawn in the figure. What shall we see if we turn this card over around its upper side?
Tim, Tom and Jim are triplets (three brothers born on the same day). Their brother Paul is exactly 3 years older. Which number can be the sum of the ages of the four brothers?
Magic trees grow in a magic garden. Each tree contains either 6 pears and 3 apples or 8 pears and 4 apples. There are 25 apples in the garden. How many pears are there?