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My answers are all shown in my picture. I worked out the answers by focusing on one question at a time. I read through the clues and crossed them out when I had used them. I worked out how many flats were on each floor first, then worked out how many families of each number there were. Then I could work out what the building looked like, it had to be symmetrical and the flats had to all be the same size (I used a ruler to make sure they were exactly the same size, and cubes!). Finally I had to work out which family were where (I had to work out which floor they were on).