The number you are looking for is 12.
Reversing the digits gives you 21
75% of 12 is 9
12 + 9 = 21
11yrs.
Find a four digit number whose digits will be reversed when multiplied by nine?
Possibility of two digit no whose sum is 9 18,27,36,45,54,63,72,81 Now add 63 to each no mentioned above output is 81,90,99,108,117,126,135,144 See 18 and 81. If you reverse 18 . 81 will come which is the no increased by 63. 18 is
192
39
63
7 two-digit numbers.
after 11yrs.
11yrs.
An eight digit number with one zero cannot remain the same when its digits are reversed. It must have an even number of 0s.
If the number with the digits reversed can have a leading 0 so that it is a 1-digit number, then 16. Otherwise 13.
27
Find a four digit number whose digits will be reversed when multiplied by nine?
five digits number when you multiply by four is the same the number when you reversed it is 21978*4 = 87912
47 Impossible problem!
Possibility of two digit no whose sum is 9 18,27,36,45,54,63,72,81 Now add 63 to each no mentioned above output is 81,90,99,108,117,126,135,144 See 18 and 81. If you reverse 18 . 81 will come which is the no increased by 63. 18 is
Prime numbers that are still prime after their digits are reversed, like (13,31)(17,71)(37,73)(79,97)(107,701)(113,311)