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Answer:
51
Step-by-step explanation:
Let the digits be x and y.
x = 5y
(10x + y) + (10y+x) = 66
=> 11x + 11y = 66
=> x + y = 6.
//substitute x = 5y in the above equation
5y + y = 6
=> 6y = 6
=> y = 1
=> x = 5
Thus the original number is 51.
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