When it reads "the quotient of 3 more than a number and 5" it is separated as follows:
"the quotient of [3 more than a number] and [5]"
Therefore Quantity 1 is 3 more than a number and Quantity 2 is 5.
You can replace "a number" with a variable (they want you to use n in this case):
3 more than n
Which is the same as saying: 3 + n
Hope this helps! :)