Ronnie read a total of 30 books over 15 months. If Ronnie has read 48 books so far, how many months has he been with his book club?

24 Months

Step-by-step explanation:

First you need to know how many books Ronnie read each month. 30 ÷ 15 = 2

Now you know Ronnie reads 2 books every month for 15 months.

So just take 48 ÷ 2 = 24

You take 48 because that's the total number of books so far and you divide it by 2, because he reads 2 books every month. That gives you a total of 24 months he has been with his book club.