Express the ratios as a fraction without reducing

Jude is making cement for a driveway. the instructions show the amount of each ingredient to make 1 batch of cement. complete each statement to adjust the ingredients for each new situation if jude uses these instructions.

Robin and john each a a 12 inch pizza about how many square inches of pizza did they eat? estimate how much pizza they ate

Me because i don't understand how to do it.: )