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Possibility of two digit no whose sum is 9

18,27,36,45,54,63,72,81

Now add 9 to each no mentioned above

27,36,45,54,63,72,81,90

See after third comma 45 and 54. Reverse of 45 is 54. 54 is 9 more than the no 45.

So 45 is original

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Q: The sum of the digits of a two-digit number is 9 If the digits were reversed the new number would be 9 more than the original number Find the original number?

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Possibility of two digit no whose sum is 17 89 and 98 Reverse of 89 is 98. 98 is 9 less than the original no 89. 89 is original no

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Possibility of two digit no whose sum is 10 19,28,37,46,55,64,73,82,91 Now add 54 to each no mentioned above 73,82,91,100,109,118,127,136,145 See after 1st comma 28 and 82 Reverse of 28 is 82. That no 82 is 54 more than the no 28. So 28 is the original

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47 Impossible problem!

Find a four digit number whose digits will be reversed when multiplied by nine?