• The sum of the two digits is 15 and the difference between them is 3. What is the product of the digits?
 A) 56 B) 63 C) 42 D) 54

 D) 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

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