Multiple choice general knowledge math & puzzles

The length of a rectangular plot is 20 metres more than its breadth. If the cost of fencing the plot @ 26.50 per metre is Rs. 5300, what is the length of the plot in metres?

  1. 40

  2. 50

  3. 120

  4. None of these

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Total perimeter = 5300 / 26.50 = 200m. Let breadth be x, length be x+20. 2(x + x + 20) = 200 => 4x + 40 = 200 => 4x = 160 => x = 40. Length = 40 + 20 = 60m. Since 60 is not listed, 'None of these' is correct.