Paragraph- Sent 1: Mike and Jeff are close friends.
Sent 2: Their school is having a guessing game to guess how many gumballs are in a box.
Sent 3: If they get the right amount they win $100.
Sent 4: If they get close they get a $20 gift card.
Sent 5: The box looks like it is missing some gumballs.
Sent 6: It turns out some people are eating them when they place their guess.
Sent 7: 100 people guessed and took a piece of candy.
Sent 8: The box is 10" by 10" by 10".
Sent 9: Each gumball is 1" each.
Sent 10: Mike guessed 500.
Sent 11: Jeff guessed 800.
Sent 12: They both said they would split their money they win, if they win. 
Question: Roughly how many gumballs are missing?
Whether the gumballs in the boxes go missing?