Please see my responses below in blue.
I have questions regarding the problem sets in chapter 8 and 10.
On page 133,
Q4. The rate of foreclosure of owner-occupied homes in the northern counties is 75% higher than those in the southern counties.
The answer is those -> that of owner-occupied homes
why not just "that"?
I'll quote from the explanation in the book; please let us know if you need further clarification.
"Here, that stands for the whole noun phrase the rate of foreclosure. We should repeat the words owner occupied homes to avoid confusion, which might arise if we write that of those in the southern counties.
Q5. Law students learn to think as a lawyer does.
It doesn't matter not to match the number between "students" and "a lawyer"?
No. When making comparisons, I do not have to worry about whether one element is singular and whether one is plural. They elements being compared just need to be logically and structurally similar. Here I am comparing the way law students think to the way a lawyer thinks.
Q15. Courtney's experiences at Haleford, a large research university with renowned professors, affluent students, and imposing buildings, were unlike her high school on the reservation.
The answer : her experiences in high school.
Can I say that "unlike those in high school"?
I see nothing wrong with that.
On page 204,
Q12. he found himself quaffing many of sodas
The answer : a number of
Why not "many"?
Since soda has "s" at the end, it can be a countable noun.
"many" would be fine but it is followed with "of sodas" in the original sentence, and the construction "many of sodas" is not allowed. Consequently, we have to say "a number of sodas" to resolve the "of sodas" problem. If I could say "many sodas" that would be acceptable.