One.
The number 1.
Yes, 1 and 11.
19 goes there, of course, unless there is more to this riddle than is so obvious!
Only 1 goes in to 9 and 11 as a whole number. Technically any number can go into any number.
The number is 1.
The number is 1.
Just 1 and 11 (11 is a prime number).
The number 5.
Well, isn't that a happy little question! Let's see here... If we take 231 and divide it by 20, we find that it goes in about 11 times with a remainder of 11. So, 20 goes into 231 about 11 times, leaving a little extra. Just remember, there are no mistakes, only happy little accidents in math!
That number is 1.
11/0.2 = 55 Therefore, 11 is 20 percent of 55.
The number eleven (11).