If the tens digit x and the units digit y of a positive integer n are reversed, the resulting integer is 9 less than n. What is y in terms of x ?  Choose the correct choice from the following:  A) 20 - x  B) 9 - x  C) x + 9  D) x - 1  E) x + 1
Original Digits=xy i.e. Number=10x+y   After reversing the digits:   Digits=yx i.e. Number=10y+x   10y+x is 9 less than 10x+y   10x+y-9=10y+x   10x-x-9=10y-y   9x-9=9y   x+1=y   OR   y=x-1   Ans:x - 1
<result>D</result>
If the tens digit x and the units digit y of a positive integer n are reversed, the resulting integer is 9 less than n. What is y in terms of x ?