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If a, b, and c are multiples of 3 such that a > b > c > 0, w [#permalink]
12 Aug 2018, 16:08
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If a, b, and c are multiples of 3 such that a > b > c > 0, which of the following values must be divisible by 3? Indicate all such values. A. a + b + c B. a – b + c C. \(\frac{abc}{9}\)
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Re: If a, b, and c are multiples of 3 such that a > b > c > 0, w [#permalink]
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ExplanationSince a, b, and c are all multiples of 3, a = 3x, b = 3y, c = 3z, where x > y > z > 0 and all are integers. Substitute these new expressions into the statements. First statement: \(a + b + c = 3x + 3y + 3z = 3(x + y + z)\). Since (x + y + z) is an integer, this number must be divisible by 3. Second statement: \(a  b + c = 3x  3y + 3z = 3(x  y + z)\). Since (x + y + z) is an integer, this number must be divisible by 3. Third statement:\(\frac{abc}{9}=\frac{3x \times 3y \times 3z}{9}=\frac{27xyz}{9}= 3xyz\). Since xyz is an integer, this number must be divisible by 3.
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Re: If a, b, and c are multiples of 3 such that a > b > c > 0, w [#permalink]
06 Jul 2019, 13:36
sandy wrote: If a, b, and c are multiples of 3 such that a > b > c > 0, which of the following values must be divisible by 3?
Indicate all such values. A. a + b + c B. a – b + c C. \(\frac{abc}{9}\) There is a little bit problem with this type of question, like when you solve the question. and get two or three answer choices, and when you just put your answer in one case (A), then try to put the second answer in (B/C) but before this, the GRE Timer just stop when you click answer A. Need some Web coding to dynamic this. Thanks
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Re: If a, b, and c are multiples of 3 such that a > b > c > 0, w [#permalink]
07 Jul 2019, 00:37
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Re: If a, b, and c are multiples of 3 such that a > b > c > 0, w [#permalink]
15 May 2020, 01:42
How is choice b not wrong? If C=3, b=6, c=9 Then, 6+39=0



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Re: If a, b, and c are multiples of 3 such that a > b > c > 0, w [#permalink]
15 May 2020, 03:08
diegogre wrote: How is choice b not wrong? If C=3, b=6, c=9 Then, 6+39=0 The condition states that, a>b>c a=9, b=6, c=3 96=3 3+3=6 6/3 =3



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Re: If a, b, and c are multiples of 3 such that a > b > c > 0, w [#permalink]
15 May 2020, 08:15
As embarrasing as it sounds. I didn't realize addition and subtraction are done left to right Posted from my mobile device



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Re: If a, b, and c are multiples of 3 such that a > b > c > 0, w [#permalink]
15 May 2020, 08:26
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diegogre wrote: As embarrasing as it sounds. I didn't realize addition and subtraction are done left to right Posted from my mobile device You're not the first person to believe that. The acronym (PEMDAS or BEDMAS) seems to suggest that Addition must occur before Subtraction. To avoid this problem, we should read the acronym as follows: P E MD AS
This format shows that multiplication and division are on the same hierarchical level. That is, neither operation is more important than the other. So, we perform these operations from left to right. Likewise, the format shows that addition and subtraction are on the same level. So when given the option addition and subtraction, we perform those operations from left to right.
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Re: If a, b, and c are multiples of 3 such that a > b > c > 0, w
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