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The length and breadth of play ground are 36 m and 21 m respectively. Flag staffs are required to be fixed on all along the boundary at a distance of 3 m part. The number of flag staffs will be___________?

Correct answer: B. 38

  • A. 37
  • B. 38
  • C. 39
  • D. 40

Explanation

The playground perimeter is 2(36 m + 21 m) = 114 m. At a spacing of 3 m, the number of equal boundary intervals, and therefore flag staffs on a closed boundary, is 114 m ÷ 3 m = 38. Students may choose 37 by forgetting that the boundary is closed and the final interval returns to the starting point.

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