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Q: How many two digit whole numbers are increased by 18 when their digits are reversed?

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27

If the number with the digits reversed can have a leading 0 so that it is a 1-digit number, then 16. Otherwise 13.

The sum of all palindromic numbers from 1001 to 9999 is 495000.

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

47 Impossible problem!

The same as the number of two-digit numbers, since the last two digits must the same as the first two, only reversed. So I'll say there are 100 four-digit palindromes.

With 123 digits you can make 123 one-digit numbers.

The same as the number of two-digit numbers, since the last two digits must the same as the first two, only reversed. So I'll say there are 100 four-digit palindromes.

There are 5460 five digit numbers with a digit sum of 22.

The digits product of two digit has number four

The number you are looking for is 12. Reversing the digits gives you 21 75% of 12 is 9 12 + 9 = 21

93 (and 39).

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