The digit digit of two digit number one decade is twice the number. The number of the new number and the original number, which are obtained from the number swap, is equal to 66. Find the original number.
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=10(2x)+x=20x+x=21x
=10(x)+2x=10x+2x=12x
after interchanging
21x+12x=66
33x=66
x=66/33
x = 2
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