What is the difference between 97 and 79

Aubrey read 29 books and eli read 52 books what number is equal to the number of books aubrey read?

Hurry if the population of of an ant hill doubles every 10 days and there are currently 100 ants living in the ant hill what will the ant population be in 20 days

What adds to be the bottom number but also multiplies to be the top number with 8 on the bottom and 15 on top