Question
Quantitative Ability and Data Interpretation Question on Number Systems
X and Y are the digits at the unit's place of the numbers (408X) and (789Y) where X ≠ Y. However, the digits at the unit's place of the numbers (408X)63 and (789Y)85 are the same. What will be the possible value(s) of (X + Y)?
Example: If M = 3 then the digit at unit's place of the number (2M) is 3 (as the number is 23) and the digit at unit's place of the number (2M)2 is 9 (as 232 is 529).
A
9
B
10
C
11
D
12
E
None of the above
Answer
10
Explanation
Solution
The correct option is (B) : 10