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26 Jul 2018, 11:51
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Mirren1
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:
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.
27 Jul 2018, 02:46
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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
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 
05 Nov 2019, 12:50
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Hi All,
We're told that Lindsay can paint 1/X of a certain room in 20 minutes - and that Lindsay AND Joseph can paint the FULL room in 1 hour. We're asked what fraction of the same room can Joseph paint in 20 minutes on his own. This question can be solved in a couple of different ways, including by TESTing VALUES.
To start, the math involved would be really easy if BOTH Lindsay and Joseph paint at the same rate. Thankfully, we CAN choose values that will make that happen. If the two work at the same rate, then each will paint 1/2 the room in 1 hour. By extension, in 20 minutes (re: 1/3 of an hour), each would paint (1/3)(1/2) = 1/6 of the room every 20 minutes. Thus, let's TEST X = 6.... meaning that Lindsay paints 1/6 of the room in 20 minutes and Joseph also paints 1/6 of the room in 20 minutes.
We're looking for an answer that equals 1/6 when X = 6. There's only one answer that matches...
Final Answer:
GMAT assassins aren't born, they're made,
Rich
We're told that Lindsay can paint 1/X of a certain room in 20 minutes - and that Lindsay AND Joseph can paint the FULL room in 1 hour. We're asked what fraction of the same room can Joseph paint in 20 minutes on his own. This question can be solved in a couple of different ways, including by TESTing VALUES.
To start, the math involved would be really easy if BOTH Lindsay and Joseph paint at the same rate. Thankfully, we CAN choose values that will make that happen. If the two work at the same rate, then each will paint 1/2 the room in 1 hour. By extension, in 20 minutes (re: 1/3 of an hour), each would paint (1/3)(1/2) = 1/6 of the room every 20 minutes. Thus, let's TEST X = 6.... meaning that Lindsay paints 1/6 of the room in 20 minutes and Joseph also paints 1/6 of the room in 20 minutes.
We're looking for an answer that equals 1/6 when X = 6. There's only one answer that matches...
Final Answer:
GMAT assassins aren't born, they're made,
Rich
