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Re: If x, y, and z are positive integers, is x+y divisible by 5? 1) x+z is [#permalink]

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24 Aug 2017, 11:28

Q1. When the Q says x, y, z are integers, shouldn't we take all as different numbers but all the explanations here have considered x equal to y to reach to the answers. So is it that, unless explicitly defined as unique there is no need to take different values. Because the Q also doesn't say explicitly that x, y, z can take any value.

Q2. Also under the assumption that they are all different, would E still be the right answer, based on the following: 2+8 & 7+8 both divisible by 5 but 2+7 is not 5+0 & 10+0 both divisible by 5 and so is 5+10

Q1. When the Q says x, y, z are integers, shouldn't we take all as different numbers but all the explanations here have considered x equal to y to reach to the answers. So is it that, unless explicitly defined as unique there is no need to take different values. Because the Q also doesn't say explicitly that x, y, z can take any value.

Q2. Also under the assumption that they are all different, would E still be the right answer, based on the following: 2+8 & 7+8 both divisible by 5 but 2+7 is not 5+0 & 10+0 both divisible by 5 and so is 5+10

Answer to Q1 x, y, z might be same or x, y, z might be different. The point is that there two answers.

Answer to Q2 The example you have shown are good enough to identify that both condition together are not sufficient.
_________________

Re: If x, y, and z are positive integers, is x+y divisible by 5? 1) x+z is [#permalink]

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30 Aug 2017, 00:10

Luckisnoexcuse wrote:

(1) tells us x,z can take (0,5),(5,0).... also no information about y..not sufficient (2) tells us y,z can take (0,5),(5,0).... also no information about x..not sufficient on combining x,y can take (0,0) or (5,5) ...not sufficient E

Hey mate, though your answer is correct, I would like to point out that 0 cannot be considered as the question stems says x,y, and z are positive integers. Appears Luckisnoexcuse got lucky!