How do you solve a rational problem like
(1/x) + (2/(x+1))

Cam bought some used books for $4.95. he paid $0.50 each for some books and $0.35 each for the others. he bought fewer than 8 books at each price. how many books did cam buy?

Write a story that matches with the expression 42x-5 pls hurry

Ineed in figuring out this problem.