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### Question Asked by a Student from EXXAMM.com Team

** Q 1720223111. ** Suppose `ABC` is a triangle with `AB` of unit length.

`D` and `E` are the points lying on `AB` and `AC`

respectively; such that `BC` and `DE` are parallel. If

the area of `DeltaABC` is twice the area of `DeltaADE`, then

the length of `AD` is

**CDS 2016 **