William can eat 3 slices of pizza in 5 minutes. If he continues to eat at the same rate, how long will it take him to eat the whole pizza, which has 12 slices of pizza? How many slices can he eat in half of an hour?

William can eat 18 slices of pizza in half of an hour.

William can eat a whole box of pizza in 20 minutes.

Step-by-step explanation:

30 minutes in half of an hour, 30/5 is 6.

3 slices in 5 mins

3 times 6 is 18.

3 slices --->   12 slices

              x4

5 mins--->   20 mins

           x4

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180