In a 4 × 100 m relay race, Chana runs the first 100 meters in XIX seconds. Jack runs the second leg in XXI seconds. Yuan runs the 3rd leg in XXVIII seconds and Zhang runs the final 100 meters in XVI seconds. In how many seconds did they complete the race (in Roman numerals)?

A poultry farm produced 228593 eggs in a year. It packaged 60342 eggs and sent them to market while 84660 eggs got destroyed. How many eggs are left with the poultry farm?

The weight of people travelling on a bus is ^@730^@ kg ^@127^@ g. Two new passengers weighing ^@80^@ kg ^@247^@ g and ^@70^@ kg ^@252^@ g took the same bus. Find the total weight of people travelling on that bus.

The cafeteria at a summer camp has 43 tables. Each table seats 23 campers. About how many campers can eat in the cafeteria at the same time? Choose the better estimate.