Apizza is cut into slices that are each \dfrac16 6 1 start fraction, 1, divided by, 6, end fraction of the whole. john is going to eat \dfrac12 2 1 start fraction, 1, divided by, 2, end fraction of the whole pizza. how many slices will john eat? slices

For this case, the first thing we must do is calculate the number of slices.
 We have then:
 N = (whole pizza) / (1/6 whole pizza)
 N = (1) / (1/6)
 N = 6 slices
 We now calculate the amount of slices that John will eat:
 Slices = (1/2) * (6)
 Slices = 3
 
 john will eat 3 slices

The answer is 10. and if you go by pemdas you would 1. multiplication 2. division 3. addition 4. subtraction