A) 9
B) 81
C) Cannot be known
D) 18
Correct Answer: A
Solution :
Let the number of two digits is \[\left( 10x+y \right)\] \[\therefore \]The number formed by reversing the digits \[=10y+x\] \[\therefore \] \[10x+y+10y+x=99\] \[\Rightarrow \] \[11x+11y=99\] \[\therefore \] \[(x+y)=\frac{99}{11}=9\]You need to login to perform this action.
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