% 7?
If the number 16 is added to its reverse,
.
The sum is 77 which is divisible by 7.
But you will not find many numbers have this property.
For example
, which is not divisible by 7.
How many two digit-number has this properties?
Assume that is not a two-digit number.
The answer is 11.
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1 solution
XY + YX = 11 * (X+Y)
solve (X + Y) = 7 or 14
1- 16, 61
2- 25 ,52
3- 34, 43
4-59, 95
5- 68, 86
6- 77