a museum opened at 10 a.m. by 10:30 a.m., 356 people had entered the museum. at the total same rate what is the total number of people who entered from 10:00 a.m. to 1:30 p.m.
You can list them out- for every half hour, add 356. 10:30- 356 11:00- 712 11:30- 1068 OR figure out how many half hours from 10:00 to 1:30 which is 7. Multiply 7 by 356.