fghasemi wrote:
Hello
could you please help to solve this problem!
i'm solving some GMAT sample exam, but today i found this problem:
1. Is x an integer?
-- x is evenly divisible by 1/2.
-- x is evenly divisible by 2.
i dont understand what is the meaning of this quotation?
what is "evenly divisible by 1/2 or 2" mean, could you show me some more example and describe it to me more.
Thanks
Farshid
Welcome to Gmat Club Farshid,
Can you please post PS questions in the PS subforum:
gmat-problem-solving-ps-140/ and DS questions in the DS subforum:
gmat-data-sufficiency-ds-141/No posting of PS/DS questions is allowed in the main
Math forum.
Back to the question.
Is x an integer?(1) x is evenly divisible by 1/2.
(2) x is evenly divisible by 2.
This is not a good question. Definitely not a GMAT type.
On GMAT when we are told that a is divisible by b (or which is the same: "a is multiple of b", or "b is a factor of a"), we can say that:1.
a is an integer;
2.
b is an integer;
3.
\frac{a}{b}=integer.
So the terms "divisible", "multiple", "factor" ("divisor") are used only about integers (at least on GMAT).
So, you won't see statement like "x is evenly divisible by
1/2" on GMAT.
Suppose that the intended meaning of this question was as below:
Is x an integer?(1) x divided by 1/2 is an integer --> now, if x=1 (1 divided by 1/2 equals to 2) then the answer to the question will be YES but if x=0.5 (0.5 divided by 1/2 equals to 1) then the answer to the question will be NO. Not sufficient.
(2) x is evenly divisible by 2 --> directly tells us that x is an even integer. Sufficient.
Answer: B, (so answer A is also incorrect).
For more on number theory check:
math-number-theory-88376.htmlHope it helps.
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