Find the number!

Click here for the solution

By checking options
91-19=72

Or

Let the number be xy
So 10x + y = 10 ….. (i)

When the number is reversed the new number is yx
So (10y + 10 ) – ( 10x +y ) = 72 ….(ii)

From Eqs. (i) & (ii)
x = 1 and y =9
∴number = 19

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