M02-03

Question

How many of the 810 new members registered on a website in June were from the USA?

(1) In June, the ratio of new members from the USA, Europe, and Asia was 4:3:2 respectively.
 
(2) In June, no new members were from locations other than the USA, Europe, and Asia.

Bunuel · Accepted Answer

Official Solution:

How many of the 810 new members registered on a website in June were from the USA? 
 
(1) In June, the ratio of new members from the USA, Europe, and Asia was 4:3:2 respectively.
 
 The above is not sufficient to answer the question because we don't know whether there were new members from other parts of the world (Africa for example).
 
(2) In June, no new members were from locations other than the USA, Europe, and Asia. The above is also not sufficient to answer the question because it only tells us where the new members were from, but it does not give us any information about their distribution.
 
(1)+(2) The second statement tells us that all 810 new members were from the USA, Europe, and Asia. Statement (1) gives us the ratio of new members from each of these regions. Using this information, we can set up an equation:  4x + 3x + 2x = 810 , where  x  is a common factor of the ratio. Solving the equation, we get  x = 90 . Therefore, the number of new members from the USA is  4x = 4*90 = 360 . Sufficient.
 
Answer: C

sammyxiao · Answer

I think this is a good question to test your knowledge of the concept. I got 50/51 in this test, and I got this question wrong. I have learned now. Thank you.

BottomJee · Answer

I think this is a  high-quality  question and I agree with explanation. GMAT wants us to be literal and literal we have to be in this question!

Bunuel · Answer

I have edited the question and the solution by adding more details to enhance its clarity. I hope it is now easier to understand.

Sushi_545 · Answer

Hi @Bunel ,

I think there is some flaw in the question language we do can fetch USA new members but the statement does not explicitly say that they registered for website

say we found 100 people belongs to US but how many actually registered for the website is not clear from both statement

so i chose option E.

Bunuel · Answer

Both the question stem and the statements mention "new members," so they clearly refer to the same group of 810 people who registered. There's no ambiguity.

dotsoftme · Answer

Why Answer A is not correct?? As in question stem and in option A, no information about the other part of the world is given so we should assume that the given information is sufficient for answer the question.

Bunuel · Answer

Statement (1) not mentioning other regions does not mean there are none. It simply gives a ratio for the three named regions, nothing more. Even if you know nothing about geography and don’t know that there are other regions, you still cannot assume there are none. So without a statement saying these three groups make up the whole 810, the number from the USA can vary, so (1) cannot be sufficient.

paridhinag90 · Answer

what if x is 45 that is 8x+6x+4x the ratio is 8:6;4

Bunuel · Answer

The point is that the ratios 4:3:2 and 8:6:4 are equivalent. They represent exactly the same proportions.

If you double all parts of the ratio, the value of x simply adjusts accordingly so that the total still equals 810. You do not get a different number of USA members. The final result remains the same because the proportions are unchanged. You'd get x = 45, and USA = 8x = 360, still.

M02-03

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