AMC 8 Question

A large square region is paved with n^2 gray square tiles, each measuring s inches on a side. A border d inches wide surrounds each tile. The figure below shows the case for n=3. When n=24, the 576 gray tiles cover 64% of the area of the large square region. What is the ratio d/s for this larger value of n? AMC8_2020_22

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Answer:

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