help would be greatly appreciated

USCIS processes (accepts or rejects) an average of 6.3 million immigration cases per year, and average processing time is 0.63 years. The number of pending cases it has on the average = O [cases]. During a typical day, on average, Subway has 18 customers in the store. Each customer spends (an average) 6-minutes in the store. Subway can serve [customers] during the 10 hours it is open. On average, 200 customers arrive to a Burger King Shop in the two-hour lunch break period. There are on average 45 customers inside Burger King, waiting to get food or having lunch. Each customer on average spends A [minutes] in Burger King. An insurance company processes 6000 claims per year (50 Weeks). The average processing time 2 weeks. The number of claims on average in the inventory is A claims)