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Lindsay can paint 1/x of a certain room in one hour. If Lindsay and Jo

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Lindsay can paint 1/x of a certain room in one hour. If Lindsay and Jo  [#permalink]

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New post 26 Jul 2018, 10:51
1
Mirren1 wrote:
I don't think this is a good question since you can plug the number 2 in and you would get A or C as the answer.

Can someone comment their opinion on the question quality?

Mirren1 , if you choose to assign values, and your values give you two correct answers, then the fault is not in the question.

I think you might be a little confused about what happens when you pick values.

If you get two correct answers, for example, you just need to pick a different set of values to figure out which of your guesses is correct.

I picked 5. I did so because question writers are ready for you to plug in easy and ordinary numbers.

So I pick "unusual" but manageable numbers. Although it is possible to get just one correct answer at times, I almost never use 0, 1, or 2.

I wrote in my post
Quote:
If the algebraic equation eludes you, pick an unusual number for \(x\).


Here is a post with lots of links, all of which should help, about picking numbers and other strategies. Scroll down to @mikmcgarry if the link does not send you to his post directly:
HERE

The question is fine, and typical of a GMAT question.

Hope that helps. :-)
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Lindsay can paint 1/x of a certain room in one hour. If Lindsay and Jo  [#permalink]

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New post 27 Jul 2018, 01:46
hi Narenn, generis :-) nice explanations , i almost followed your examples but added my personal touch with a few tweaks :)

Lindsay rate \(\frac{1}{X}\)

Joseph work done in 20 min ---> \(20 * \frac{1}{x}\)

Joseph rate ---> work/rate 1/x / 20 =\(\frac{1}{20x}\)

now lindsay rate + josephe rate

\(\frac{1}{x}\)+\(\frac{1}{20x}\)= 1 isnt it correct ? :-) :?

\(\frac{1}{20x}\)= \(1\) - \(\frac{1}{x}\) :?


by the way Narenn, in your profil pic i wonder do you stand facing the sun or with your back to the sun ? :)

if i had such DS question my answer would be between A or B :lol: its hard to figure out between these two answer options which one is correct :)

have a great weekend guys :-) I can already smell the beginning of weekend :)
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Lindsay can paint 1/x of a certain room in one hour. If Lindsay and Jo &nbs [#permalink] 27 Jul 2018, 01:46

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