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by FightWithGMAT » Sun Aug 29, 2010 11:12 pm
pradeepkaushal9518 wrote:Question #9 (incorrect)

The attrition of tooth enamel stems from erosion, which occurs only when teeth grind against hard substances. Therefore, those who regularly clench or grind their teeth together will suffer higher rates of enamel attrition than those who do not.

Which of the following most strongly supports this argument?


(A) Tooth enamel can be chipped in sports accidents.

(B) Grinding and clenching both have the same effect on tooth enamel.

(C) Tooth enamel is an extremely hard substance.

(D) Most people do not grind or clench their teeth together.

(E) Front teeth are more likely to grind against one another than back teeth are.

C is perfectly fine here.
Clenching and grinding cause erosion, but erosion can happen when teeth grind against hard substances.
that means teeth have hard enamel.

Wonderful question.
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by pradeepkaushal9518 » Mon Aug 30, 2010 1:30 am
every one is saying B but oa is C . hey experts please help
A SMALL TOWN GUY
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by uwhusky » Mon Aug 30, 2010 7:24 am
pradeepkaushal9518 wrote:every one is saying B but oa is C . hey experts please help
Why don't you email one of the Knewton experts?
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by SeemaSkl » Mon Aug 30, 2010 4:40 pm
Thumbs up to this ques!

Notice the arg. says erosion is caused when teeth grind against something hard. But what do teeth grind against? They grind against teeth.......so teeth have to be hard to cause erosion on teeth. That is why C is the right answer. It says teeth have to be hard which we just figured so it only strengthens the arg.
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by ankurmit » Tue Aug 31, 2010 9:06 pm
You are right SeemaSKL and fighttheGmat.

Now C seems a better option to me

YOu have given good reasoning
Thanks
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Ankur mittal
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