Given that R is positive three-digit integer, what is the hundreds digit of R?
1. The hundreds digit of 3R is 8
2. (R+1) results in a number with the hundreds digit of 9.
[spoiler]OA=C[/spoiler].
Experts, may you help me here? I would like to know how to solve this DS question.
Given that R is positive three-digit integer, what is
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Given: R is a positive three-digit integerGmat_mission wrote:Given that R is a positive three-digit integer, what is the hundreds digit of R?
1. The hundreds digit of 3R is 8
2. (R+1) results in a number with the hundreds digit of 9.
[spoiler]OA=C[/spoiler].
Experts, may you help me here? I would like to know how to solve this DS question.
We have to determine the hundreds digit of R.
Let's take each statement one by one.
1. The hundreds digit of 3R is 8.
=> 3R can be a 3- or a 4-digit number. Example, Say R = 299, then 3R = 899 (a 3-digit number); again say, R = 600, then R = 1800 (a 4-digit number).
We cannot determine the unique value of the hundreds digit of R. Insufficient.
2. (R +1) results in a number with the hundreds digit of 9.
=> R can be any number between 899 to 998. We cannot fix the unique value of the hundreds digit of R. Insufficient.
(1) and (2) together
R cannot be 899 as 3R = 899*3 = 2697; we see that the hundreds digit of 3R is not 8! Thus, R must be a number between 900 to 998. The unique value of the hundreds digit of R = 9. Sufficient.
The correct answer: C
Hope this helps!
-Jay
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