P5/P6 Math: Area (Overlapping Triangles in Rectangle)

The question presents 3 triangles overlapping each other within a rectangle.

An area that is clipped out within the rectangle is given.
The length and breadth of the rectangle is also provided.
Each of the heights of the 3 triangles is also the breadth of the rectangle.

This question often appears in Paper 1 of P5 exams.
Calculator usage is not allowed.


The Triangle Musical Instrument 


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