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Two positive integers a and b are divisible by 5, which is their

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Intern
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B
Joined: 23 Nov 2014
Posts: 3
Re: Two positive integers a and b are divisible by 5, which is their [#permalink]

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New post 09 Jan 2017, 06:54
Hi All,

basically this question does not require complicated math at all, even though I solved it using the math too.
But after some considerations I came up with this approach:

The questions asks us for the concrete values of a and b.
As long as the solution is not a=b (which is explicitely denied in statement 2 and GMAT statements never contradict each other) we can either find at least 2 values or the information is not sufficient at all.
As neither in statement 1 nor in statement 2 nor in the question stem itself is given any clue, which of the value has to be assigned to a and which to b, the answer choice will always be E.

The situation would change, if e.g. statement 2 were "The smaller number a ..." and you would have to do the math to come up with C instead of E.

But the question is, is it worthwhile to watch out for such a 'simple' solution or not (i.e. hurl oneself immediately into the math).
I guess such 'simple' cases are quite rare and it definitely costs time to check for such cases.
It will certainly cost you ~ 10 secs to check for the above situation and for a positive will shortcut the answer so that you save 100 secs (it took me 180 seconds to solve this one),
so with 15 DS questions, it will cost you ~ 150 secs for the check and, as there is probably only one 'simple' case, will save you ~ 100 secs,
the bargain is negative.

What is your opinion or your experience?
Are there other 'simple' cases that might make it worthwhile to watch out for them in a bunch?
Is there some statistics available to confirm either way - check first or hurl into math immediately?
Intern
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Joined: 13 Mar 2016
Posts: 1
Re: Two positive integers a and b are divisible by 5, which is their [#permalink]

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New post 19 Apr 2017, 09:06
I just have one doubt wrt statement 1. Where is that another 5 coming from?
Manager
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Joined: 18 Jan 2018
Posts: 53
Re: Two positive integers a and b are divisible by 5, which is their [#permalink]

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New post 18 Feb 2018, 02:00
Tough one to interpret & crack correctly.
Re: Two positive integers a and b are divisible by 5, which is their   [#permalink] 18 Feb 2018, 02:00

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Two positive integers a and b are divisible by 5, which is their

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