Hey guys,
I think I can answer all of these! The original question from sl750 I think stemmed from this:
Amount/Number
Singular: Amount (The amount of water in the lake is decreasing)
Plural: Number (The number of clouds in the sky is increasing)
And was to the extent of - wait...isn't "the number" supposed to be singular? And why is the verb "is" there if it's the "Plural" example?
My explanation: I'm using "clouds" as an example of a plural/countable noun. And so you wouldn't use the "singular" term "amount" for that, you're use the plural descriptor "number". So, as a modifier of a noun, "number" goes to plural nouns, and "amount" goes to singular ones.
On its own, however, "number" is a singular noun. So "number" requires the verb "is". So in that sentence:
The number of clouds is increasing.
"The number" describes clouds. But the clouds themselves aren't increasing, so "the number" is the subject and requires the verb "is".
Does that explain it? Sorry to muddle the issue with multiple nouns! (although that's exactly what the GMAT does)
And, yes, "a number of..." is like saying "some" (it's "a" number...we don't know which number but it's one of them: 5, 8, 24...), so you'd say "a number of (some) students are increasing their consumption of ice cream now that the dorm has installed a self-serve machine."
I hope that clears it all up... Great discussion!
Brian Galvin
GMAT Instructor
Chief Academic Officer
Veritas Prep
Looking for GMAT practice questions? Try out the Veritas Prep Question Bank.
Learn More.