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The answer is E.

A) were combined to total 110 miles, a distance that is about Long Island's length - the problem is that the NUMBER of miles is singular, not plural so "were" is wrong. also, "that is" in the second part is unnecessary. overall, the second part of the sentence is also awkward because of the use of possessive "long island'S" which is not right

B) were combined to total 110 miles, a distance about the length of Long Island - the second part of the sentence is much better, but still the problem is that the NUMBER of miles is singular, not plural so "were" is wrong

C) was combined to total 110 miles, a distance that is about Long Island's length - "was" is correct and singular in relation to NUMBER of miles, but "that is" in the second part is unnecessary. overall, the second part of the sentence is also awkward because of the use of possessive "long island'S" which is not right

D) was combined to total 110 miles, about Long Island's length - "was" is correct and singular in relation to NUMBER of miles, but the second part of the sentence is awkward because of the use of possessive "long island'S" which is not right

E) was combined to total 110 miles, a distance about the length of Long Island - great! this is correct. "was" is correct and singular in relation to NUMBER of miles, there is no unnecessary "that is" and the "length of Long Island" is correct as opposed to "Long Island's length"
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IMO, E is the correct answer, however, frankly, i stuck between C and E.

During the charity walk-a-thon, the number of miles walked by the fifteen volunteers were combined to total 110 miles, a distance that is about Long Island's length.

A) were combined to total 110 miles, a distance that is about Long Island's length - "The number of " must use "was" instead of "were", whereas, "a number of" must use "were" - Eliminate A

B) were combined to total 110 miles, a distance about the length of Long Island - Eliminate B for the same reason in A

C) was combined to total 110 miles, a distance that is about Long Island's length - "a distance that is about Long Island's length" is a type of noun + noun modification and noun + noun modification can modify anything. However, i remember that length of Long island is more preferable to Long Island's length because "'s" should use for the living thing, for example, Ronaldo's hat is more preferable than hat of ronaldo. Can anyone help to confirm?

D) was combined to total 110 miles, about Long Island's length - length of Long Island's is more preferable.

E) was combined to total 110 miles, a distance about the length of Long Island - also noun + noun modification, but length of Long island is more preferable

Thanks and best regards
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generis

Project SC Butler: Day 143: Sentence Correction (SC2)


For SC butler Questions Click Here
During the charity walk-a-thon, the number of miles walked by the fifteen volunteers were combined to total 110 miles, a distance that is about Long Island's length.
Sentence Structure
Subject - Verb
      During the charity walk-a-thon,
    the number of miles walked by the fifteen volunteers was combined to total 110 miles,
      a distance about the length of Long Island

Issues:
    The singular subject( the number of miles) requires singular verb.
      The number of Xs: Singular
      A number of Ys: Plural
    A and B SV disagreement

    The possessiveness( X's ) of inanimate things SHOULD be avoided.
    Ex:
      Advanced navigation system of Mars Rover is better than Mars Rover's advanced navigation system
    PS: It's a preference, NOT a rule.

Answer choice analysis:
    A) were combined to total 110 miles, a distance that is about Long Island's length
      SV disagreement

    B) were combined to total 110 miles, a distance about the length of Long Island
      SV disagreement

    C) was combined to total 110 miles, a distance that is about Long Island's length
      The possessiveness( X's ) of inanimate objects SHOULD be avoided.

    D) was combined to total 110 miles, about Long Island's length
      The possessiveness( X's ) of inanimate objects SHOULD be avoided.

    E) was combined to total 110 miles, a distance about the length of Long Island
      Better than the rest. E is the winner!
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During the charity walk-a-thon, the number of miles walked by the fifteen volunteers were combined to total 110 miles, a distance that is about Long Island's length.

A) were combined to total 110 miles, a distance that is about Long Island's length - the number is singular

B) were combined to total 110 miles, a distance about the length of Long Island - the number is singular

C) was combined to total 110 miles, a distance that is about Long Island's length - - GMAT doesn't Island's length

D) was combined to total 110 miles, about Long Island's length - GMAT doesn't Island's length

E) was combined to total 110 miles, a distance about the length of Long Island - the best answer
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IMO correct answer is E

The 3/2 split is depending on the subject Verb agreement , here "the number of...." is a singular subject which will inturn take a singular verb "was", not "were".

Clearly A & B can be discarded.

Remaining options are C,D & E.

Now possible differentiation i took to eliminate C & D is because the use of possessive noun, "Long Island's length".

I took E as the answer as it is clear & direct.
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I have posted the official explanation HERE
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