Use proportions to solve each of the problems below.  

1. At the zoo, three adult lions together eat $250$ pounds of food a day. If two more adult lions joined the group and ate food at the same rate as the original three, how much food would the zoo need to provide all five lions each day?

   Step (a):

   Write a proportion comparing the number of lions and the pounds of food per day.

   Answer (a):

   About $416.7$ lbs of food per day

2. Byron can read $45$ pages in an hour. At that rate, how long would it take him to read the new $700$-page Terry Cotter book?

   Step (b):

   Write a proportion comparing the number of pages and time (in hours).

3. What is the unit rate of pounds of food per lion in part (a)?

   Hint (c):

   There are $5$ lions sharing $416.7$ lbs of food. How many does each lion get?