Question

The sum of the digits of a two-digit number is 9 less than the number. Which of the following digits is at unit's place of the number ?

A) 1 B) 2 C) 3 D) data inadequate

Answer 1

Let x,y are the digits of a number. Then the number = 10x+y

as per condition : 10x+y-9 = x+y

=> 9x=9,

=> x=1, which is the tenth’s digit.

So, we can say that for any value of y from 1 to 9, the condition satisfies.

for eg: if the number is 18

18–9 = 1+8

9=9 , satisfied.

Answer 2

Data inadequate is your answer.