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1. x+y=12 এবং x-y=2 হলে xy--এর মান কত?

  • A. 40
  • B. 40
  • C. 40
  • D. 40

Answer: Option D

Explanation:

  x+y = 12

   x-y = 8

(Doing Addition), we get, 2x = 20 or, x= 10

(Doing Subtraction), we get, 2y = 4 or, y= 2

So, xy = 10*2 = 20 (Ans)


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