Question

A two digit number is less than 20. The sum of the digits is double that of their product. What is the number? (A) 12 (B) 15 (C) 13 (D) 11​

Answer 1

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Let the numbers be x and y.

• x+y = 2xy
• x(2y-1) = y
• x = y/(2y-1).
• Here if y=1, x=1.

Thus the number = 11.

Answer 2

Answer:

d.) 11.

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