Question

A 2 digit number is less than 20. The sum of thecdigits is double that of their product.What is the number ?

Answer 1

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

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 answers
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