Considering Special Circumstances: Problem 2

Problem: As shown in the figure, inside trapezoid ABCD, E and F are each midpoints of AB and CD. G is a random point on EF. Given that triangle ADG has an area of 15 centimeter squared, and that triangle BCG is exactly 7/20 of ABCD, then the area of ABCD is ______.

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Key: 1. Identifying keywords
2. Considering special situations
3. Analyze situation
4. Solve equations

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