18 is a number which is equal to twice the sum of its digit
The sum of digits is 1+8 = 9. So the only positive TWO-DIGIT integer that is exactly twice the sum of its digits is 18.
18 is a number which is equal to twice the sum of its digit
The sum of digits is 1+8 = 9. So the only positive TWO-DIGIT integer that is exactly twice the sum of its digits is 18.