The sum of the digits of a two digit number is 9 less than the number. Which of the following digits is at units place of the number?	Pick one
A) 1 B) 2 C) 3 D) Data inadequate E) None
Sol.   Let the ten's digit be x and unit's digit be y.   Then, (10x + y) - (x + y) = 9 or x = 1.   From the data, we cannot find y, the units digit.   So, the data is inadequate.   Answer Data inadequate
<result>D</result>
The sum of the digits of a two digit number is 9 less than the number. Which of the following digits is at units place of the number?