Wipro Company Numerical Ability Number System

If the tens digit a and the units digit b of a positive integer x are reversed, the resulting integer is 9 more than x. What is b in terms of a ?
A. 10-a
B. 9-a
C. a+9
D. a-1
E. a+1

Read Solution (Total 1)

let the no be 10 a +b=X, on reversing the no would be new_no=10 b+a,so as per question
= new_no=X+9
= 10 b+a =10 a+b+9
=> 9 b= 9 a+9
=> 9 b= 9(a+1)
=> b= a+1
so a+1 is the answer i.e D option in correct one.
7 years agoHelpfull: Yes(0) No(0)

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