Barney can perform 45 sit-ups in one minute. Carrie can do twice as many sit-ups per minute as Barney can. And Jerrie can do 5 more sit-ups per minute than Carrie can do. If Barney does sit-ups for 1 minute, and Carrie does sit-ups for two minutes, and Jerrie does sit-ups for three minutes, what would be the combined total number of sit-ups performed?
Thoughts? Step-by-step reasoning:
Carrie can do 2 * 45 = 90 sit - ups per minute. Jerrie can do 90 + 5 = 95 sit - ups per minute. In two minutes, Carrie would perform 90 * 2 - 180 sit - ups. And in three minutes, Jerrie would perform 3 * 95 = 285 sit - ups. Thus, in the scenario described, in total, the three would perform 45 + 180 + 285 = 510 sit - ups.
Thus, the answer is 510.