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Brain Twister #13: Number Venns

Can you solve this week’s logic puzzle? Plus our quick quiz and the answer to last week’s problem

By Bethan Ackerley and Peter Rowlett

27 March 2024

New Scientist. Science news and long reads from expert journalists, covering developments in science, technology, health and the environment on the website and the magazine.

#13 Number Venns

Set by Peter Rowlett

Numbers 1–30 are put in circle A if they are part of group A, in circle B if they belong to group B, in the intersection between if they are part of both A and B, or outside the circles if they don’t belong to either A or B. What are groups A and B for each diagram below (not all numbers have been placed yet)?

Only one of these diagrams can have another number added to the overlapping section using these rules. Which one is it and what is the number?…

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