Tides typically range from three to six feet

Question

Tides typically range from three to six feet, but while some places show no tides at all, some others, such as the Bay of Fundy, have tides of at least thirty feet and more.

Option A
Option B
Option C
Option D
Option E

(This question is from Official Guide. Therefore, because of copyrights, the complete question cannot be copied here. The question can be accessed at GMAT Club)

Solution

Sentence Analysis

  • Tides typically range from three to six feet, (Main Subject: Tides; Main Verb: range)
  • but while some places show no tides at all, (Another independent clause. In ‘while dependent clause – Subject: some places; Verb: show)
  • some others, such as the Bay of Fundy, have tides of at least thirty feet and more. (Within Second IC, Main Subject: some others; Main Verb: have)

The sentence first presents a usual range of height of tides and then presents a contrast that while some places have no tides, others have tides much higher than the usual range.

The sentence has the following problems:

  1. “some places do X… some others do Y” construction is not correct. The correct construction is ‘some places do X… others do Y’. In other words, the use of ‘some’ in ‘some others’ is incorrect.
  2. The use of ‘and more’ is redundant since ‘at least thirty feet’ already allows the height to be more than thirty feet.

Option Analysis

(A) Incorrect. For the reasons mentioned above.

(B) Incorrect. For the following reasons:

  1. There is no main clause after the ‘while clause’. ‘that have tides…’ modifies ‘the others’. Thus, there is no verb for the subject ‘the others’.
  2. The use of the article ‘the’ in ‘the others’ is incorrect since ‘others’ refers to an indefinite set of places.

(C) Correct.

(D) Incorrect. For the following reasons:

  1. There is no main clause after the ‘while clause’. ‘which has tides…’ modifies ‘Bay of Fundy’. Thus, there is no verb for the subject ‘those at the Bay of Fundy’.
  2. If ‘those’ refers to places, ‘places at the Bay of Fundy’ doesn’t make much sense since ‘Bay of Fundy’ is also a place.

(E) Incorrect. For the following reasons:

  1. If ‘the ones’ refers to places, ‘places at the Bay of Fundy’ doesn’t make much sense since ‘Bay of Fundy’ is also a place.
  2. Problem no. 2 of the original sentence

If you have any doubts regarding any part of this solution, please feel free to ask in the comments section.

About Chiranjeev Singh

An Alumnus of IIM Ahmedabad and with scores of 780 (2017) and 770 (2013) on GMAT and 99.98%ile on CAT, Chiranjeev is one of the most qualified GMAT tutors in India. Chiranjeev has earlier served as Director of Curriculum at e-GMAT. Chiranjeev has been helping students ace GMAT since 2012. He follows a concept-based methodology to teaching GMAT and is very committed to student success. You may contact him for any private GMAT tutoring needs at CJ@GMATwithCJ.com. He conducts online sessions for students across the world.

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