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In trapezoid ABCD, AD||BC, E, F is the midpoint of AB and CD.$S_{\triangle ABD}:S_{\triangle BCD} = 3:7$. EF divides the trapezoid into top and bottom parts. Find the ratio of top part to bottom part.

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It is visited by 14,000 - 28,000 people daily, mostly from USA, Bulgaria, Russia, India, Philippines, Ukraine, Serbia...

In 2011 was created a Russian version, and in 2015 Serbian.