HarveyKlaus wrote:

If the unit digit of the positive integer n is 5, what is the tens digit of n?

(1) The tens digit of n+5 is 7.

(2) The tens digit of n-6 is 5.

(1)The tens digit of n+5 is 7;value of n ranged from 65 to 72,Since unit digit is 5,thus n=65,so tens digit of n=6,

Sufficient(2) The tens digit of n-6 is 5;value of n ranged from 56 to 65,Since unit digit is 5,thus n=65,so tens digit of n=6,

SufficientCorrect Answer D
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Md. Abdur Rakib

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