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Just add the rations it is 12 , so if she buys 12 fruits she has 7 lemons , therefore , when she buys 24 she has 14 lemons.

The statement says 'Total number of fruits bought is 24' which you could include fruits other than kiwis, bananas and lemons. But may be I getting just to picky.

Mary bought some kiwis, bananas, and lemons at the grocery store in proportion of 1 : 4 : 7 accordingly. How many lemons did Mary buy?

- The total number of fruits Mary bought is 24. - Mary bought 8 bananas.

Answer is D.

This is a value based question. S1. total number of fruits is 24 ..just add the ratio it is 12 so she bought 7 lemons out of 12 total fruits ..in such case we can find the number of lemons if total fruits are 24. S1. is sufficient ---- eliminate the answers b , c , e

S2. she bought 8 bananas ..which gives the number of lemons as 14. S2. is sufficient ......eliminate a.

Am finding it difficult to understand why we have to assume that there are no other fruits and that we should just add the ratios to verify the assumption that there are no other fruits.

Consider this problem from m02#3, for instance.

If a website registered 810 new members in June, how many of the new, registered members were from North America?

A) In June, the ratio of new members from North America, Europe and Asia was 4:3:2 respectively. B) In June, none of the members were from locations other than North America, Europe and Asia.

Here too the ratios from (A) can be added to get exact proportions of 810, but we still need to know information from (B) to answer this problem correctly.

Am I missing something? Can someone please explain exactly, precisely the difference, if any, between the Mary problem and the Website problem?

I don't have a very good answer but I'll do my best.

The Mary question stem clearly noted three kinds of fruit Mary bought. The website problem, on the other hand, makes it clear by S1 and S2 that members registered from different locations and not only from those listed in the questions stem.

I'm sure you won't need to make assumptions of this kind on the real GMAT. Hope this helps .

I don't have a very good answer but I'll do my best.

The Mary question stem clearly noted three kinds of fruit Mary bought. The website problem, on the other hand, makes it clear by S1 and S2 that members registered from different locations and not only from those listed in the questions stem.

I'm sure you won't need to make assumptions of this kind on the real GMAT. Hope this helps .

sid3699 wrote:

Can anyone explain this please:?:

Hope so:)

One needs to evaluate S1 and S2 on a stand alone basis before combining them. This is what is throwing me off in the Mary problem.