Answer:

Step-by-step explanation:

Y =

This is because the total cost is 10x + 480 and then that needs to be divided by the amount of people.
Please see the pic, I'd solved your question in it.
51.5 Hectograms + 5100 Grams
51,500 Decigrams = 5100 Grams
They have same mass because they equal each other.