Troubles with some riddles!!!!

I want to show you a group of riddles that i found so pretty good and they are here:

1. Anyone with culinary qualities can take some eggs and elaborate a tortilla with them. Of course is hard. How much would make a device that receive tortillas as inputs and the output produced shell eggs?

Are you able to find a solution to this problem?

.....Answer:

There is already a workable solution: a live chicken. Feed it with with tortillas and thanks to its interior design, produce and whole eggs separated.

2. Are you able to get the numbers from 0 to 9 as a result of mathematical operations using 4 fours and basic arithmetic operations (addition, substraction, multiplication and division)?

For example, suposse that you want to get the number 15,a possible solution would be (4*4)-(4/4)=15

.....Answer:

0 = 4 + 4 - 4 - 4
1 = (4 / 4) / (4 / 4)
2 = (4 / 4) + (4 / 4)
3 = (4 + 4 + 4) / 4
4 = ((4 - 4) * 4) + 4
5 = ((4 * 4) + 4) / 4
6 = 4 + ((4 + 4) / 4)
7 = (4 + 4) - (4 / 4)
8 = 4 + 4 + 4 - 4
9 = 4 + 4 + (4 / 4)

3. Three knights of the round table addressed with urgency to a meeting with King Arturo. During the long journey decided to stop at an inn to restore your energy.

Each calls for a steak to the innkeeper and urged him to have dinner ready in thirty minutes.

The innkeeper is a problem, since only two fillets can be cooked simultaneously and each should be cooked for 10 minutes on each side, so that in 20 minutes would have cooked two of them but would need 20 minutes to cook the third.

How will the innkeeper cook the hree steaks in 30 minutes with the above limitations?

........Answer:

The chef put the first two threads (say 1 and 2) and cook for one side.

After 10 minutes brings one of the steak (steak 1) you flip the second and third place to cook.

After 10 minutes, the thread 2 is fully cooked and steaks 1 and 3 are cooked on one side so that in 10 minutes will cook the other side and have them all ready in 30 minutes.