Colour balloons: how many ways?

How many ways can the balloons be coloured? A logical thinking exercise.

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How many presents could each of the three girls have got from a total of 20. They all got an even number of presents!

How many different addition, subtraction and multiplication questions can be made with the cards shown?

How many different addition sentences can be made using the numbers shown?

How many ways can the apples be put in the boxes so that there is an even number of apples in each box?