Question:

Five gallons of petrol are not enough to cover the distance.

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In grammar, treat units of measurement as singular when they describe one total quantity, even if the unit word appears plural.
Updated On: Aug 14, 2025
  • Five gallons
  • of petrol
  • are not enough
  • to cover the distance
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The Correct Option is A

Solution and Explanation

The phrase "Five gallons" is a plural form, but here it refers to a single quantity or measurement. In English grammar, units of measurement (time, distance, volume, etc.) are treated as singular when considered as a whole amount.
Therefore, the verb should be singular: "is not enough" instead of "are not enough". The error lies in the mismatch between the plural form of "gallons" and the singular meaning of the quantity.
Correct sentence: "Five gallons of petrol is not enough to cover the distance."
Why the other options are correct:
- Option (B) "of petrol" — correct prepositional phrase specifying the substance.
- Option (C) "are not enough" — grammatically wrong in this case because of subject-verb agreement, but correctly placed here for meaning if the subject were truly plural.
- Option (D) "to cover the distance" — correct infinitive phrase showing purpose.
Grammar Rule — Subject-Verb Agreement with Measurements:
When measurements of time, money, weight, or volume act as a single unit, use a singular verb.
More examples:
- "Two hours is enough to finish the work." (not "are enough")
- "Ten miles is too far to walk."
- "Five litres of water is sufficient for the trip."
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