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 ?
Choose the correct choice.
A) 5 B) 6 C) 7 D) 8 E) 9
(10x+y)=(10y+x)+9   =&gt; 9x-9y=9   =&gt; x-y=1   and only 8 numbers satisfy this condition and the numbers are 21,32,43,54,65,76,87,98   ANSWER:8
<result>D</result>
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 ?