There are five such numbers.
30,25,15,20, or 10.
There are 15 of them.
There are no three-digit numbers that equal 17. In fact, there are no numbers with more or less than two digits that equal 17. In fact, in the whole infinite supply of numbers, there is only one single number that equals 17. That number is . . . . . . . 17 .
With a total of 90,000 five digit numbers, we can conclude that there is 45,000 EVEN five digit numbers.
None. 3 digit numbers are not divisible by 19 digit numbers.
There are 21 two-digit prime numbers.
No digit that is 5 places long is equal to 6 times 2 other than 12.000