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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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