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

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Senior SC Moderator
Joined: 22 May 2016
Posts: 2117
Lindsay can paint 1/x of a certain room in one hour. If Lindsay and Jo  [#permalink]

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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.
VP
Joined: 09 Mar 2016
Posts: 1110
Lindsay can paint 1/x of a certain room in one hour. If Lindsay and Jo  [#permalink]

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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 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
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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