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This problem is intended to get children to look really hard at something they will see many times in the next few months. It is easy to glance at something, recognise it, and not know afterwards how it really looked.
You could start by showing the whole group the ring design on a white-board. You can find it here.
What can you tell me about the picture?
Learners could see what shapes can be linked in this way and which would not work. Alternatively, they could work out many different ways the five rings could be coloured with five colours used, and possibly draw all these combinations.
Suggest just drawing and colouring the unjoined rings.
Andrew decorated 20 biscuits to take to a party. He lined them up and put icing on every second biscuit and different decorations on other biscuits. How many biscuits weren't decorated?