The number of boys- countable or uncountable? I'm confused with this sir.
There are fewer boys than girls in the class.
There are more girls than boys in the class.
The number of boys in the class is less than the number of girls.
The number of girls in the class is greater than the number of boys.
A number can't be fewer or more; it's either less or greater. It's a number. One number.
I hope this answers your question.
"Number" as a quantificational noun is non-count, though it has both singular and plural forms. Its status as a non-count noun is evident from the fact that it can't take cardinal numbers: there's no *"one/two/nine numbers of boys". Which means that the whole NP "the number of boys in the class" ..." is likewise non-count.