Buttons in the boxes

Three boxes and 20 buttons. How many different ways can the buttons be put in the boxes so that each box has an even number?

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

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

19 buttons to sort into odd numbers.

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