SOLUTION: If the tens digit x and the unit digit y of a positive integer n are reversed, the resulting integer 9 is more than n, what is y in terms of x?
(A)10-x
(B)9-x
(C)x+9
(D)x-1
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-> SOLUTION: If the tens digit x and the unit digit y of a positive integer n are reversed, the resulting integer 9 is more than n, what is y in terms of x?
(A)10-x
(B)9-x
(C)x+9
(D)x-1
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Question 339427: If the tens digit x and the unit digit y of a positive integer n are reversed, the resulting integer 9 is 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
The answer is E, x+1 but I am not getting it. Could you please explain.
You can put this solution on YOUR website! If the tens digit x and the unit digit y of a positive integer n are reversed, the resulting integer 9 is more than n, what is y in terms of x?
The given positive integer n = 10x + y
The resulting positive integer when the integers are reversed is 10y + x
(10y + x) = (10x + y) + 9
10y + x = 10x + y + 9
Add -y - x to both sides
9y = 9x + 9
y = x + 1
Edwin
