A large square region is paved with n² gray square tiles,each measuring sinches 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？（　?。?br />一個大的正方形區(qū)域用n²個灰色的正方形瓷磚鋪設，每塊瓷磚的邊長為s英寸。每塊瓷磚周圍有d英寸寬的邊框。下圖顯示了n=3的情況。當n=24時，576塊灰色瓷磚覆蓋了大正方形區(qū)域的64%。對于這個較大的n值，

d

s

比率是多少？（　?。?/h1>