MHB Help with Periodic Table Question, don't know what I'm doing wrong.

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Users are encouraged to share their progress when seeking help with questions about the periodic table to facilitate effective assistance. This approach allows helpers to identify where the user is struggling and avoid redundant suggestions. The community emphasizes the importance of showing work or thoughts to enhance the support provided. Engaging in this manner is seen as a way to save time for both the user and the helpers. Clear communication of efforts is essential for productive discussions.
ilovewatermelon
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Hello ilovewatermelon and welcome to MHB! :D

We ask that our users show their progress (work thus far or thoughts on how to begin) when posting questions. This way our helpers can see where you are stuck or may be going astray and will be able to post the best help possible without potentially making a suggestion which you have already tried, which would waste your time and that of the helper.

Can you post what you have done so far?
 

Thread 'Area of Overlapping Squares'

Here is a little puzzle from the book 100 Geometric Games by Pierre Berloquin. The side of a small square is one meter long and the side of a larger square one and a half meters long. One vertex of the large square is at the center of the small square. The side of the large square cuts two sides of the small square into one- third parts and two-thirds parts. What is the area where the squares overlap?
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