[問題] Form32 Sec3-Q15

[sam6521]

If the tens digit x and the units digit y of a positive integer n are reversed , the resulting integer is 9 more than n. What is y in terms of x?

(A)10-x
(B)9-x
(C)x+9
(D)x-1
(E)x+1

Ans:(E)

[navywhite0425]

10x+y+9=10y+x

so,y=x+1

its E