The bones in a bat's wing that are near the tip have less

Question

The bones in a bat's wing that are near the tip have less mineral content in proportion to organic content than do the bones that are next to the bat's shoulder. This difference increases biomechanical efficiency, because the more weight there is at the wing tip, the harder the bat has to work to fly.
Which of the following is most strongly supported by the information?

(A) The mineral compounds in a bat's bones are heavier than the organic compounds.
(B) The more a bat weighs, the mare difficulty it has in flying.
(C) The bones in a bird's wing have a ratio of mineral content to organic content similar to that in the bones in a bat's wing.
(D) Bats that have the lowest ratio of mineral content to organic content in their bones are those that can fly most efficiently.
(E) Bats would not be able to fly if all their bones had the same ratio of mineral content to organic content.

Gnpth · Answer

(A) The mineral compounds in a bat's bones are heavier than the organic compounds-  When we read the premise carefully, we can find that mineral compounds are more than organic compounds in bats bone apart from the wing tips- If there are more mineral compounds then it must be heavier than organic compound- exactly the restatement of the premise- So HOLD

(B) The more a bat weighs, the mare difficulty it has in flying-  It is out of scope- we don't need the overall weight of the bat, but just the information about the wings.

(C) The bones in a bird's wing have a ratio of mineral content to organic content similar to that in the bones in a bat's wing-  It generalizes to birds, but we are talking only about bats.

(D) Bats that have the lowest ratio of mineral content to organic content in their bones are those that can fly most efficiently-  This is a trap, as it uses the similar words but provides us a irrelevant information- We don't want any ratios, but just need to know what we inferred. As basically, Inference is "What else must be true"
 
(E) Bats would not be able to fly if all their bones had the same ratio of mineral content to organic content-  Same as D .

So the answer is A.

shagalo · Answer

Where in the premise you can find that ?? Could you explain the answer A more please.

thanks

Gnpth · Answer

The premise 1 says that "Mineral content is less in the wings tip than the organic content". 
 
But the bone in the bat shoulder has more mineral content compared to organic content.

Premise 2 : more weight in the wing tips- bat has to work harder to fly.

Clearly, we can see that mineral content is key here. If its more in the wing tips, it will increase the weight in wing tip.

If mineral content are more than the organic content in the bones, then obviously it must be heavier than the organic content.

Hope it helps.

shagalo · Answer

i still don't get it. 
the argument compares 2 kinds of bones. the wings (which has less MIN than ORG ) and the shoulder (which has more MIN than ORG) 
how about the other body's bones ?? such as chest , legs , back .. etc. do they have more MIN than Org too like the shoulders ? 
because the answer A talks about the whole bones has more MIN than ORG ..  ( The mineral compounds in a bat's bones are heavier than the organic compounds.)

i couldn't find in the arguments how can we judge the whole bones with more MIN than ORG .

thanks

GoonerGalactico · Answer

The answer is not clear to me.

The bones in a bat's wing that are near the tip have less mineral content in proportion to organic content than do the bones that are next to the bat's shoulder

Assume organic content to be 10 and mineral content to be 5 near the shoulder and 3 near the tip. Now 3/10 < 5/10. How is A correct? Could someone please explain?

Valii · Answer

The answer to your questions can be found in this sentence:

This difference increases biomechanical efficiency, because the more weight there is at the wing tip, the harder the bat has to work to fly.

Firstly, this sentence states that more (less) weight at the wing tip; requires the bat to work harder (allows the bat to work less hard) in order to fly; and biomechanical efficiency is decreased (increased).

Secondly, the sentence states that the difference in mineral- versus organic content (i.e. less mineral than organic content) increases biomechanical efficiency. Hence, it automatically follows that mineral content weighs more than organic content.

So the answer here is A.

I hope my comments here are helpful.

JarvisR · Answer

T he bones in a bat's wing that are near the tip have less mineral content in proportion to organic content than do the bones that are next to the bat's shoulder. 
This  difference increases bio-mechanical efficiency , because  the more weight there is at the wing tip, the harder the bat has to work to fly. 
Infer Question:
Which of the following is most strongly supported by the information?

(A) The mineral compounds in a bat's bones are heavier than the organic compounds.
>>Correct.
(B) The more a bat weighs, the mare difficulty it has in flying.
>>Arg is concerned only to weights in wing tips.
(C) The bones in a bird's wing have a ratio of mineral content to organic content similar to that in the bones in a bat's wing.
>>No info reg this in arg.
(D) Bats that have  the lowest ratio of mineral  content to organic content in their  bones  are those that can fly most efficiently.
>> Too general and nothing in arg to infer this.Trap
(E) Bats would  not be able to fly  if  all their bones had the same ratio  of mineral content to organic content.
>> From the arg, we cant infer any such info. Trap

Arjun02 · Answer

I don't understand how we get A as an answer choice. According to me I could infer that the ratios of M/O is higher near shoulder than that to tip. But how is that relevant with A as it is talking about the entire body. Isn't this bringing outside information?  GMATNinja  can you shed some light on this question. Is it a gmat level question?

PSP92 · Answer

Hi Arjun02 !
I am no expert but I don't think any of the options can be justified using the information in the argument.
As far as Option A is concerned, I can think of two cases: One where the ratio of mineral content to organic content is greater than one and one where its less than one.
Also, we only have information about the bones in the shoulders and the wings and therefore cannot comment on the bats' bones as a whole.
I don't think you should be too concerned about this question.

Arjun02 · Answer

Posted erroneously, pl. ignore.

Arjun02 · Answer

Hey PSP92,

I did a little more thinking, and this is what I could realize. See if it makes sense.

Thinking - M = mineral content, O = organic content, WT = wing tip, Shoulder = S
WT has some M and some O
S has more M and lesser O than WT's.
This difference in content increases BIO and Mech efficiency.
More weight at WT, harder the bat has to work to fly.
This means that weight of WT is < than weight of S 
Implying that Weight of some M and some O is < than weight of more M and lesser O

SEE Right Hand Side, you will notice that as you are increasing M and decreasing O, the weight increases, meaning that the per-unit weight of M should be more than per unit weight of O.
And this is what A is saying - 'The mineral compounds in a bat's bones are heavier than the organic compounds'.

I hope my thinking is correct. If not, feel free to give your input.

VerbalBot · Answer

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The bones in a bat's wing that are near the tip have less

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