17
Any two digit number in which: (a) the units digit is not 0, and (b) the two digits are different will form a new 2-digit number when the digits are interchanged.
Not necessarily. Consider 444. The digits are not different. The first and second digits are not multiples of 3 The first digit is not greater than the second digit. In spite of all that, 444 is a 3-digit number
Six.
Any 5-digit number is greater than a 4-digit one.
There are 40 possible answers. There can be any digit in the tens place. The digit in the hundreds place must be 6 more than the one in the units place.
The number is 36
47 Impossible problem!
Find a four digit number whose digits will be reversed when multiplied by nine?
192
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
If the number with the digits reversed can have a leading 0 so that it is a 1-digit number, then 16. Otherwise 13.
"If the units digit and the hundreds digit of the number 513 were reversed..." 315 'find the sum of the original number and the new number." 513+315=828
An eight digit number with one zero cannot remain the same when its digits are reversed. It must have an even number of 0s.
45
A) If a number has two digits, then the sum of its digits is less than the value of the original two-digit number.
100000 2847239582
2178