1. ## about numbers

Usually, we say, "This library has twice as many books as that one." and "The new usb has twice the storage capacity of the old one."
Then is it possible to say "The number of the books in this library is twice of that one"
or "The storage capacity of the new usb disc is twice as large as the old one"?

2. ## Re: about numbers

Originally Posted by chance22
Usually, we say, "This library has twice as many books as that one." and "The new usb has twice the storage capacity of the old one."
Then is it possible to say "The number of the books in this library is twice of that one"
or "The storage capacity of the new usb disc is twice as large as the old one"?

Yes, it is possible.

3. ## Re: about numbers

Usually, we say, "This library has twice as many books as that one." and "The new usb has twice the storage capacity of the old one."
Then is it possible to say "The number of the books in this library is twice of that one"
or "The storage capacity of the new usb disc is twice as large as the old one"?

The "usb disc" sentence seems fine to me, but not "The number of the books in this library is twice of that one".
I would say:
"The number of the books in this library is twice the number in that one".
"The number of the books in this library is twice the amount in that one".
"The number of the books in this library is twice what's in that one".

not a teacher

4. ## Re: about numbers

Originally Posted by JMurray
Usually, we say, "This library has twice as many books as that one." and "The new usb has twice the storage capacity of the old one."
Then is it possible to say "The number of the books in this library is twice of that one"
or "The storage capacity of the new usb disc is twice as large as the old one"?

The "usb disc" sentence seems fine to me, but not "The number of the books in this library is twice of that one".
I would say:
"The number of the books in this library is twice the number in that one".
"The number of the books in this library is twice the amount in that one".
"The number of the books in this library is twice what's in that one".

not a teacher

If changing it at all, I would say:

"The number of books in this library is twice the number of that one."

5. ## Re: about numbers

The number of books in this library is twice that of the old one.
The storage capacity if this USB is twice that​ of my previous one.

6. ## Re: about numbers

Originally Posted by emsr2d2
The number of books in this library is twice that of the old one.
The storage capacity if this USB is twice that​ of my previous one.

Those sentences add further context that could be incorrect.

By saying 'old one' you are implying the one you're talking about is a new one, not just a different library.
The same as with the USB. By saying 'of my previous one' you are implying he already had one. He could be comparing two USBs in the store?

7. ## Re: about numbers

Fine.

The number of books in this library is twice that of/in that one.
The storage capacity of this USB drive is twice that of that one.

No matter how you start or end the sentence "twice that" is still correct.

8. ## Re: about numbers

"The number of books in this library is twice the number of that one."
This is a very poor sentence. It's unclear and unnatural.

9. ## Re: about numbers

Thank you all so much for the help. I'll take emsr2d2's suggestion and use "twice that of..."

10. ## Re: about numbers

Originally Posted by chance22
Thank you all so much for the help. I'll take emsr2d2's suggestion and use "twice that of..."
If your goal is a natural sentence, try "This library has twice as many books as..." and avoid the "the number" phrasing.

I think many of us would agree that although "twice that of that one" is grammatically correct it is stylistically poor.

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