Answer:
Answer is 2184
Step-by-step explanation:
1st of all we need to know the total number of novels in the library if I have it with a ratio of one meaning:
2---------624
1----------???
(1×624)÷2 =312
Meaning with a ratio of 1 I'll have 312
Take the 312 and multiply with 7
It will give you 2184
That's the number of Novels which were bought by joe