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If x, y, and z are consecutive integers such that x > y > z [#permalink]
21 Jul 2013, 07:55

2

This post was BOOKMARKED

00:00

A

B

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E

Difficulty:

65% (hard)

Question Stats:

55% (02:45) correct
45% (01:15) wrong based on 112 sessions

If x, y, and z are consecutive integers such that x > y > z and the sum of x, y, and z is a multiple of 10, which of the following could be the value of x?

Re: If x, y, and z are consecutive integers such that x > y > z [#permalink]
21 Jul 2013, 08:19

Expert's post

vibhav wrote:

If x, y, and z are consecutive integers such that x > y > z and the sum of x, y, and z is a multiple of 10, which of the following could be the value of x?

Guys I think 2 answers are correct. What do you come up with?

Given that \(z + y +x = (y-1) + y + (y+1) = 3y = 10k\) --> \(y\) is a multiple of 10 --> \(x = y+1\), so x is a multiple of 10 plus 1. Only answer choices B fits: \(z=-1\), \(y=0\), and \(z=1\) --> \(z+y+x=0\).

Answer: B.

Else you could simply plug-in values for x in (x-2) + (x-1) + x and see which one yields a multiple of 10. _________________

Re: If x, y, and z are consecutive integers such that x > y > z [#permalink]
15 Dec 2014, 04:01

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Re: If x, y, and z are consecutive integers such that x > y > z [#permalink]
23 Dec 2014, 10:20

1

This post received KUDOS

Expert's post

Hi All,

This question can be easily beaten by a bit of "brute force" and TESTing THE ANSWERS.

We're given a very specific set of restrictions in this prompt: 1) X, Y and Z are CONSECUTIVE INTEGERS 2) X > Y > Z 3) X+Y+Z = a multiple of 10

We're asked which of the 5 answer COULD be the value of X given these restrictions. Rather than staring at the screen or doing layered math, we can "brute force" the answers until we find one that fits these restrictions..

Answer A: X = 0 In this case, the numbers would be 0, -1, and -2. The sum = -3 which is NOT a multiple of 10. Eliminate A.

Answer B: X = 1 In this case, the numbers would be 1, 0, and -1. The sum = 0 which IS a multiple of 10. B IS the answer.

For the sake of argument, if you did not immediately realize that 0 is a multiple of 10, then you could quickly TEST the remaining 3 options and quickly disprove them.

Re: If x, y, and z are consecutive integers such that x > y > z [#permalink]
25 Dec 2014, 09:42

Expert's post

Hi pacifist85,

Your approach works here, but ONLY because 0 is the multiple of 10 that is involved in the correct answer. If it was any other multiple of 10, then you would have only gotten the solution by "brute forcing" your equation into every possible multiple of 10.

eg.

3x - 3 = 10 3x - 3 = 20 3x - 3 = 30 Etc.

Since these answer choices in this question are all relatively small, even if you did have to brute force multiple possibilities, you would have gotten to the answer relatively quickly, so I think that your approach is fine. In the end, I measure any approach by 2 things:

1) Did it get you the correct answer. 2) Were you able to complete the question relatively quickly (for that prompt).

If the answer to both questions is YES, then you did well.

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