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This is a Area question.

   Shaded  unshaded  Total    
  2u 5u 7u  
         

Ares of square = 100

Area of shaded = 100 ÷ 2 =50

2u = 50 

1u = 25

5u = 5 × 25 = 125

 

Note

Move the point X to the line SP, you will get a right angle triangle.

Move the point Y to the line QR, you will get a right angle triangle.

These two triangles = half the square.

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