Brooke needs to get a 98 on the final to get an average of 80. So you know that the total of the five given score is 382 by adding all the scores. Now you multiply the average, 80 by 6 for the total of six tests including the final which is 480 Then you subtract 480-382 to find your answer.
One minute later at 8:01pm. One lighthouse will flash 3 times (at 20, 40 and 60 seconds)...the other will flash twice (at 30 and 60 seconds). So they will both flash 60 seconds later, at 8:01
