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When coins were made of silver, their size and weight were in direct proportion to their face value; therefore, the half dollar was necessarily twice as big as the quarter.


A) the half dollar was necessarily twice as big as the quarter
This sounds awkward. However, I've learned that I can't base the sound as a rule out. I don't see anything wrong. Keep.

B) half dollars were necessarily twice larger than quarters
'Twice larger'? This should be 'twice as large as...' Out.

C) half dollars were necessarily twice larger than that of the quarter
Same reasoning as B.

D) it was necessary that half dollars were twice as much as quarters
'Twice as much' is Vague. This could refer to the size or value of half dollars -- if it is value, then it should be 'double the amount of..'? Whereas, in A, 'twice as big' refers to the size, the meaning of the sentence.

E) quarters were necessarily half as big as the half dollar
Instead of 'half as big as...', it should be twice as large as... Also, you are comparing 'plural quarters' with 'singular half dollar.' Out.
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When coins were made of silver, their size and weight were in direct proportion to their face value; therefore, the half dollar was necessarily twice as big as the quarter.


A) the half dollar was necessarily twice as big as the quarter-> "twice as big" is talking about size of coin. It is correct. Let's keep it.

B) half dollars were necessarily twice larger than quarters-> twice larger than, here twice is modifying larger, but it has to modify larger than quarters. Incorrect. We need "twice as large as ...."

C) half dollars were necessarily twice larger than that of the quarter-> Now, both errors are corrected. "that of" refers to Size of. It makes sense. Let's keep it.-> Same as B.

D) it was necessary that half dollars were twice as much as quarters-> Comparison error, we are not talking about size now. Incorrect

E) quarters were necessarily half as big as the half dollar-> We are comparing "quarters" with "dollar". Incorrect.

So, It is A. :)
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Comparison between coins for their size and weight.

A) the half dollar was necessarily twice as big as the quarter: Here comparison is proper and idiom twice as big as is correct. Keep it

B) half dollars were necessarily twice larger than quarters: not correct, it shall be twice bigger than, like A is bigger than B

C) half dollars were necessarily twice larger than that of the quarter: itroduces one more error than B. comparison error

D) it was necessary that half dollars were twice as much as quarters: size and weight both are countable

E) quarters were necessarily half as big as the half dollar: singular & plural

IMO A
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When coins were made of silver, their size and weight were in direct proportion to their face value; therefore, the half dollar was necessarily twice as big as the quarter.


A) the half dollar was necessarily twice as big as the quarter Correct

B) half dollars were necessarily twice larger than quarters Incorrect

idioms error - twice larger than

C) half dollars were necessarily twice larger than that of the quarter Incorrect

idioms error - twice larger than that of

D) it was necessary that half dollars were twice as much as quarters Incorrect

meaning change - twice as much as?

E) quarters were necessarily half as big as the half dollar Incorrect

comparison error - quarters compare with the half dollar
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Need to use Big rather than Large. Option E is wrong because of Quarters Vs Dollar.

Option A is correct.

Please post the OA.
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The official explanation is here.
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