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A rectangle, a circle and a triangle overlap as shown. What is the sum of the numbers inside the rectangle?

Competition practiceVenn Diagrams
  • A33
  • B28
  • C40
  • D24

Step-by-Step Solution

Inside the rectangle: 11 (rectangle only), 4 (rectangle and circle), 13 (rectangle and triangle) and 5 (all three). Sum . 28 forgets the 5, 40 adds the 7 outside every figure, and 24 adds only 11 and 13.
Answer: A) 33

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