Mark set a goal to average 18 sales per day at his new job to impress his new boss. His sales for the past 6 days are 14, 20, 22, 12, 16, and 20. How many sales does Marcus need on the seventh day to meet his goal?

Answer 1

To find the average sales per day, we need to add up all the sales and divide by the number of days: 14 + 20 + 22 + 12 + 16 + 20 = <<14+20+22+12+16+20=104>>104
There are 6 days in the given sales. We need to find how much short Mark is from his goal, which is 18 sales per day. Subtract Mark's sales from his goal and multiply by the number of days: (18 - 104 / 6) * 7
(18 - 17.333333333333332) * 7 = <<18-17.333333333333332=0.6666666666666685>>0.6666666666666685 * 7 = <<0.6666666666666685*7=4.6666666666666804>>4.6666666666666804
Mark needs 5 sales on the seventh day. Answer: \boxed{5}.