The first two parts of this problem provide an opportunity for learners to become familiar with Venn diagrams, whilst reinforcing knowledge of number properties. The final part introduces slightly higher-level thinking as learners then work "backwards".
If the group is not familiar with Venn diagrams, you could project the first image on an interactive whiteboard, and ask everyone to watch in silence as you place a few numbers in the correct regions. Invite the class to comment on what they notice and what they wonder, and use the ensuing discussion to clarify the representation.
Learners could try their hands at placing numbers in a Venn diagram with three circles. They could use three categories such as 'multiples of 7', 'square numbers' and 'odd numbers'. This sheet might be useful for this purpose.
You could try using this simpler version instead which uses number properties that children usually encounter before those contained in this problem.