In rectangular ABCD, ad = 30, ab = 20, e, f are divided into three equal diagonal lines, AC, then the area of △ FBE is equal to]

ABC is half of the rectangle, 30 × 20 △ 2 = 300
The height of △ FBE and △ ABC is the same, and the bottom is 1 / 3 of △ ABC, so the area is 300 △ 3 = 100

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