instructions.md

In this exercise you're going to write some code to help you cook a brilliant lasagna from your favorite cooking book.

You have four tasks, all related to the time spent cooking the lasagna.

1. Define the expected oven time in minutes

Define the Lasagna::EXPECTED_MINUTES_IN_OVEN constant that returns how many minutes the lasagna should be in the oven. According to the cooking book, the expected oven time in minutes is 40:

Lasagna::EXPECTED_MINUTES_IN_OVEN
# => 40

2. Calculate the remaining oven time in minutes

Define the Lasagna#remaining_minutes_in_oven method that takes the actual minutes the lasagna has been in the oven as a parameter and returns how many minutes the lasagna still has to remain in the oven, based on the expected oven time in minutes from the previous task.

lasagna = Lasagna.new
lasagna.remaining_minutes_in_oven(30)
# => 10

3. Calculate the preparation time in minutes

Define the Lasagna#preparation_time_in_minutes method that takes the number of layers you added to the lasagna as a parameter and returns how many minutes you spent preparing the lasagna, assuming each layer takes you 2 minutes to prepare.

lasagna = Lasagna.new
lasagna.preparation_time_in_minutes(2)
# => 4

4. Calculate the total working time in minutes

Define the Lasagna#total_time_in_minutes method that takes two named parameters: the number_of_layers parameter is the number of layers you added to the lasagna, and the actual_minutes_in_oven parameter is the number of minutes the lasagna has been in the oven. The function should return how many minutes in total you've worked on cooking the lasagna, which is the sum of the preparation time in minutes, and the time in minutes the lasagna has spent in the oven at the moment.

lasagna = Lasagna.new
lasagna.total_time_in_minutes(number_of_layers: 3, actual_minutes_in_oven: 20);
# => 26