Sorry if this question is too easy.
When N is a number, like 6, we can simply say
This box contains more than 6 balls.
Now, what if we replace '6' with a phrase like 'the number of rooms in my home'?
Of course the sentence
The number of balls in this box is greater than the number of rooms in my home.
is correct. But I'm looking for sentences beginning with 'This box contains'.