How many integers n greater than and less than 100 are there such that,if the digits of n are reversed, the resulting integer is n+9 ? Answers:
A) 5
B) 6
C) 7
D) 8
E) 9

Rationale: ( 10 x + y ) = ( 10 y + x ) + 9 = > 9 x - 9 y = 9 = > x - y = 1 and only 8 numbers satisfy this condition and the numbers are 21,32 , 43,54 , 65,76 , 87,98 answer : d
Answer: D