Hi need help again please help

Nine more than four times a number is the same as one less than twice the number. find the number?

Fanny mendelssohn manages all the magazines and paperback books at a local grocery store. she prices many paperbacks to sell at $7.99. the cost to the store is $5.29. what is the markup rate on a paperback book, based on its cost?

If 3 3/4 lb. of candy costs 20.25 how much would 1lb. of candy cost