Britney read a total of 10 books over 2 months. After belonging to the book club for 3 months, how many books will Britney have read in all? Assume the relationship is directly proportional.

she will have read 15 books in all

Step-by-step explanation:

if she has read 10 books in 2 months that means she has read 5 books each month, because 10 : 2 = 5.

so if another month passes by that means she reads another 5 books.

10 + 5 = 15

so in total britney has read 15 books in total