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Correct Answer: 54

Let the number be x and y.

Then, according to the question,

x + y = 15 …(i)

x – y = 3 …(ii)

On adding Eqs. (i) and (ii), we get

2x =18 = x = 9

On putting the value of x in Eq. (i), we get

y = 6

Therefore, Product = xy = 9 x 6 = 54