The two markers with a question mark have the same number. Which number do you have to put instead of the question mark so that the calculation is correct?
Each of the children Ali, Lea, Josef, Vittorio and Sophie get a birthday cake. The number on top of the cake shows how old the child is. Lea is two years older than Josef, but one year younger than Ali. Vittorio is the youngest. Which cake belongs to Sophie?
Maria has a total of 19 apples in 3 bags. She takes the same amount of apples from each bag. Then there are 3, 4 and 6 apples in the bags. How many apples did Maria take from each bag?
Three frogs live in a pond. Each night only one of the frogs sings a song. After 9 nights the first frog has sung 2 times. The second frog has listened to 5 songs. How many songs did the third frog listen to?
Akira lits 5 identical candles all at the same time. They stopped burning at different times and now look as shown in the picture. Which candle stopped burning first?
A gray circle with 2 large holes in it is put on top of a clock-face, as shown. The gray circle is turned around its center. Which 2 numbers is it possible to see at the same time?
A light engineer in the theatre turns the lights on and off. She uses the plan shown. How long in total are exactly 2 of the lights on at the same time?